]> git.donarmstrong.com Git - mothur.git/blobdiff - ccode.cpp
fixes while testing 1.33.0
[mothur.git] / ccode.cpp
index a3ef5e6bcb7ac8fed3fa62c49929c94b5fcdaa51..00cd3f1948e009a86456e32bbcde2a40c6f889ac 100644 (file)
--- a/ccode.cpp
+++ b/ccode.cpp
 
 #include "ccode.h"
 #include "ignoregaps.h"
+#include "eachgapdist.h"
 
-
-//***************************************************************************************************************
-Ccode::Ccode(string filename, string temp) {  fastafile = filename;  templateFile = temp;  }
 //***************************************************************************************************************
+Ccode::Ccode(string filename, string temp, bool f, string mask, int win, int numW, string o) : Chimera() {  
+ try { 
+       
+       fastafile = filename;  
+       outputDir = o; 
+       templateFileName = temp;  templateSeqs = readSeqs(temp); 
+       setMask(mask);
+       filter = f;
+       window = win;
+       numWanted = numW;
+       
+       distCalc = new eachGapDist();
+       decalc = new DeCalculator();
+       
+       mapInfo = outputDir + m->getRootName(m->getSimpleName(fastafile)) + "mapinfo";
+       
+       #ifdef USE_MPI
+               
+               //char* inFileName = new char[mapInfo.length()];
+               //memcpy(inFileName, mapInfo.c_str(), mapInfo.length());
+               
+               char inFileName[1024];
+               strcpy(inFileName, mapInfo.c_str());
+               
+               int outMode=MPI_MODE_CREATE|MPI_MODE_WRONLY;
+
+               MPI_File_open(MPI_COMM_WORLD, inFileName, outMode, MPI_INFO_NULL, &outMap);  //comm, filename, mode, info, filepointer
+               
+               //delete inFileName;
+
+               int pid;
+               MPI_Comm_rank(MPI_COMM_WORLD, &pid); //find out who we are
+               
+               if (pid == 0) {
+                       string outString = "Place in masked, filtered and trimmed sequence\tPlace in original alignment\n";
+                       
+                       MPI_Status status;
+                       int length = outString.length();
+                       char* buf2 = new char[length];
+                       memcpy(buf2, outString.c_str(), length);
+                               
+                       MPI_File_write_shared(outMap, buf2, length, MPI_CHAR, &status);
+                       delete buf2;
+               }
+       #else
 
+               ofstream out2;
+               m->openOutputFile(mapInfo, out2);
+               
+               out2 << "Place in masked, filtered and trimmed sequence\tPlace in original alignment" << endl;
+               out2.close();
+       #endif
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "Ccode");
+               exit(1);
+       }
+}
+//***************************************************************************************************************
 Ccode::~Ccode() {
+       delete distCalc;
+       delete decalc;
+       
+       #ifdef USE_MPI
+               MPI_File_close(&outMap);
+       #endif
+}      
+//***************************************************************************************************************
+Sequence Ccode::print(ostream& out, ostream& outAcc) {
        try {
-               for (int i = 0; i < querySeqs.size(); i++)              {  delete querySeqs[i];         }
-               for (int i = 0; i < templateSeqs.size(); i++)   {  delete templateSeqs[i];      }
-               delete distCalc;
+               
+               ofstream out2;
+               m->openOutputFileAppend(mapInfo, out2);
+               
+               out2 << querySeq->getName() << endl;
+               for (it = spotMap.begin(); it!= spotMap.end(); it++) {
+                       out2 << it->first << '\t' << it->second << endl;
+               }
+               out2.close();
+               out << querySeq->getName() << endl << endl << "Reference sequences used and distance to query:" << endl;
+                       
+               for (int j = 0; j < closest.size(); j++) {
+                       out << closest[j].seq->getName() << '\t' << closest[j].dist << endl;
+               }
+               out << endl << endl;
+               
+               //for each window
+               //window mapping info.
+               out << "Mapping information: ";
+               //you mask and did not filter
+               if ((seqMask != "") && (!filter)) { out << "mask and trim."; }
+                               
+               //you filtered and did not mask
+               if ((seqMask == "") && (filter)) { out << "filter and trim."; }
+                               
+               //you masked and filtered
+               if ((seqMask != "") && (filter)) { out << "mask, filter and trim."; }
+                       
+               out << endl << "Window\tStartPos\tEndPos" << endl;
+               it = trim.begin();
+               for (int k = 0; k < windows.size()-1; k++) {
+                       out << k+1 << '\t' << spotMap[windows[k]-it->first] << '\t' << spotMap[windows[k]-it->first+windowSizes] << endl;
+               }
+                       
+               out << windows.size() << '\t' << spotMap[windows[windows.size()-1]-it->first] << '\t' << spotMap[it->second-it->first-1] << endl;
+               out << endl;
+               out << "Window\tAvgQ\t(sdQ)\tAvgR\t(sdR)\tRatio\tAnova" << endl;
+               for (int k = 0; k < windows.size(); k++) {
+                       float ds = averageQuery[k] / averageRef[k]; 
+                       out << k+1 << '\t' << averageQuery[k] << '\t' << sdQuery[k] << '\t' << averageRef[k] << '\t'<< sdRef[k] << '\t' << ds << '\t' << anova[k] << endl;
+               }
+               out << endl;
+                       
+               //varRef
+               //varQuery
+               /* F test for differences among variances.
+               * varQuery is expected to be higher or similar than varRef */
+               //float fs = varQuery[query] / varRef[query];   /* F-Snedecor, test for differences of variances */
+                       
+               bool results = false;   
+                                       
+               //confidence limit, t - Student, anova
+               out << "Window\tConfidenceLimit\tt-Student\tAnova" << endl;
+                       
+               for (int k = 0; k < windows.size(); k++) {
+                       string temp = "";
+                       if (isChimericConfidence[k]) {  temp += "*\t"; }
+                       else { temp += "\t"; }
+                               
+                       if (isChimericTStudent[k]) {  temp += "*\t"; }
+                       else { temp += "\t"; }
+                               
+                       if (isChimericANOVA[k]) {  temp += "*\t"; }
+                       else { temp += "\t"; }
+                       
+                       out << k+1 << '\t' << temp << endl;
+                               
+                       if (temp == "*\t*\t*\t") {  results = true;  }
+               }
+               out << endl;    
+                       
+               if (results) {
+                       m->mothurOut(querySeq->getName() + " was found have at least one chimeric window."); m->mothurOutEndLine();
+                       outAcc << querySeq->getName() << endl;
+               }
+
+               //free memory
+               for (int i = 0; i < closest.size(); i++) {  delete closest[i].seq;  }
+
+               return *querySeq;
        }
        catch(exception& e) {
-               errorOut(e, "Ccode", "~Ccode");
+               m->errorOut(e, "Ccode", "print");
                exit(1);
        }
-}      
+}
+#ifdef USE_MPI
 //***************************************************************************************************************
-void Ccode::print(ostream& out) {
+Sequence Ccode::print(MPI_File& out, MPI_File& outAcc) {
        try {
                
-               mothurOutEndLine();
+               string outMapString = "";
+               
+               outMapString += querySeq->getName() + "\n";
+               for (it = spotMap.begin(); it!= spotMap.end(); it++) {
+                       outMapString += toString(it->first)  + "\t" + toString(it->second)  + "\n";
+               }
+               printMapping(outMapString);
+               outMapString = "";
+               
+               string outString = "";
+               string outAccString = "";
+               
+               outString +=  querySeq->getName() + "\n\nReference sequences used and distance to query:\n";
+                       
+               for (int j = 0; j < closest.size(); j++) {
+                       outString += closest[j].seq->getName() + "\t" + toString(closest[j].dist) + "\n";
+               }
+               outString += "\n\nMapping information: ";
                
-               for (int i = 0; i < querySeqs.size(); i++) {
+               //for each window
+               //window mapping info.
+               //you mask and did not filter
+               if ((seqMask != "") && (!filter)) { outString += "mask and trim."; }
+                               
+               //you filtered and did not mask
+               if ((seqMask == "") && (filter)) { outString += "filter and trim."; }
+                               
+               //you masked and filtered
+               if ((seqMask != "") && (filter)) { outString += "mask, filter and trim."; }
+                       
+               outString += "\nWindow\tStartPos\tEndPos\n";
+               it = trim.begin();
+               for (int k = 0; k < windows.size()-1; k++) {
+                       outString += toString(k+1) + "\t" + toString(spotMap[windows[k]-it->first]) + "\t" + toString(spotMap[windows[k]-it->first+windowSizes]) + "\n";
+               }
+                       
+               outString += toString(windows.size()) + "\t" + toString(spotMap[windows[windows.size()-1]-it->first]) + "\t" + toString(spotMap[it->second-it->first-1]) + "\n\n";
+               
+               outString += "Window\tAvgQ\t(sdQ)\tAvgR\t(sdR)\tRatio\tAnova\n";
+               for (int k = 0; k < windows.size(); k++) {
+                       float ds = averageQuery[k] / averageRef[k]; 
+                       outString += toString(k+1) + "\t" + toString(averageQuery[k]) + "\t" + toString(sdQuery[k]) + "\t" + toString(averageRef[k]) + "\t" + toString(sdRef[k]) + "\t" + toString(ds) + "\t" + toString(anova[k]) + "\n";
+               }
+                       
+               //varRef
+               //varQuery
+               /* F test for differences among variances.
+               * varQuery is expected to be higher or similar than varRef */
+               //float fs = varQuery[query] / varRef[query];   /* F-Snedecor, test for differences of variances */
+                       
+               bool results = false;   
+                                       
+               //confidence limit, t - Student, anova
+               outString += "\nWindow\tConfidenceLimit\tt-Student\tAnova\n";
+                       
+               for (int k = 0; k < windows.size(); k++) {
+                       string temp = "";
+                       if (isChimericConfidence[k]) {  temp += "*\t"; }
+                       else { temp += "\t"; }
+                               
+                       if (isChimericTStudent[k]) {  temp += "*\t"; }
+                       else { temp += "\t"; }
+                               
+                       if (isChimericANOVA[k]) {  temp += "*\t"; }
+                       else { temp += "\t"; }
+                       
+                       outString += toString(k+1) + "\t" + temp + "\n";
+                               
+                       if (temp == "*\t*\t*\t") {  results = true;  }
+               }
+               outString += "\n";      
+               
+               MPI_Status status;
+               int length = outString.length();
+               char* buf2 = new char[length];
+               memcpy(buf2, outString.c_str(), length);
+                               
+               MPI_File_write_shared(out, buf2, length, MPI_CHAR, &status);
+               delete buf2;
+
+               if (results) {
+                       m->mothurOut(querySeq->getName() + " was found have at least one chimeric window."); m->mothurOutEndLine();
+                       outAccString += querySeq->getName() + "\n";
                        
+                       MPI_Status statusAcc;
+                       length = outAccString.length();
+                       char* buf = new char[length];
+                       memcpy(buf, outAccString.c_str(), length);
+                               
+                       MPI_File_write_shared(outAcc, buf, length, MPI_CHAR, &statusAcc);
+                       delete buf;
                }
+
+               //free memory
+               for (int i = 0; i < closest.size(); i++) {  delete closest[i].seq;  }
+
+               return *querySeq;
        }
        catch(exception& e) {
-               errorOut(e, "Ccode", "print");
+               m->errorOut(e, "Ccode", "print");
                exit(1);
        }
 }
+//***************************************************************************************************************
+int Ccode::printMapping(string& output) {
+       try {
+                       MPI_Status status;
+                       int length = output.length();
+                       char* buf = new char[length];
+                       memcpy(buf, output.c_str(), length);
+                               
+                       MPI_File_write_shared(outMap, buf, length, MPI_CHAR, &status);
+                       delete buf;
+                       
+                       return 0;
 
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "printMapping");
+               exit(1);
+       }
+}
+#endif
 //***************************************************************************************************************
-void Ccode::getChimeras() {
+int Ccode::getChimeras(Sequence* query) {
        try {
+       
+               closest.clear();
+               refCombo = 0;
+               sumRef.clear(); 
+               varRef.clear(); 
+               varQuery.clear(); 
+               sdRef.clear(); 
+               sdQuery.clear();     
+               sumQuery.clear();
+               sumSquaredRef.clear(); 
+               sumSquaredQuery.clear(); 
+               averageRef.clear();
+               averageQuery.clear();
+               anova.clear();
+               isChimericConfidence.clear();
+               isChimericTStudent.clear();
+               isChimericANOVA.clear();
+               trim.clear();
+               spotMap.clear();
+               windowSizes = window;
+               windows.clear();
+
+       
+               querySeq = query;
                
-               //read in query sequences and subject sequences
-               mothurOut("Reading sequences and template file... "); cout.flush();
-               querySeqs = readSeqs(fastafile);
-               templateSeqs = readSeqs(templateFile);
-               mothurOut("Done."); mothurOutEndLine();
+               //find closest matches to query
+               closest = findClosest(query, numWanted);
                
-               int numSeqs = querySeqs.size();
+               if (m->control_pressed) {  return 0;  }
                
-               closest.resize(numSeqs);
+               //initialize spotMap
+               for (int i = 0; i < query->getAligned().length(); i++) {        spotMap[i] = i;         }
+       
+               //mask sequences if the user wants to 
+               if (seqMask != "") {
+                       decalc->setMask(seqMask);
+                       
+                       decalc->runMask(query);
+                       
+                       //mask closest
+                       for (int i = 0; i < closest.size(); i++) {      decalc->runMask(closest[i].seq);        }
+                       
+                       spotMap = decalc->getMaskMap();
+               }
                
-               //break up file if needed
-               int linesPerProcess = numSeqs / processors ;
+               if (filter) {
+                       vector<Sequence*> temp;
+                       for (int i = 0; i < closest.size(); i++) { temp.push_back(closest[i].seq);  }
+                       temp.push_back(query);  
+                       
+                       createFilter(temp, 0.5);
                
-               #if defined (__APPLE__) || (__MACH__) || (linux) || (__linux)
-                       //find breakup of sequences for all times we will Parallelize
-                       if (processors == 1) {   lines.push_back(new linePair(0, numSeqs));  }
-                       else {
-                               //fill line pairs
-                               for (int i = 0; i < (processors-1); i++) {                      
-                                       lines.push_back(new linePair((i*linesPerProcess), ((i*linesPerProcess) + linesPerProcess)));
-                               }
-                               //this is necessary to get remainder of processors / numSeqs so you don't miss any lines at the end
-                               int i = processors - 1;
-                               lines.push_back(new linePair((i*linesPerProcess), numSeqs));
+                       for (int i = 0; i < temp.size(); i++) { 
+                               if (m->control_pressed) {  return 0;  }
+                               runFilter(temp[i]);  
                        }
                        
-                       //find breakup of templatefile for quantiles
-                       if (processors == 1) {   templateLines.push_back(new linePair(0, templateSeqs.size()));  }
-                       else { 
-                               for (int i = 0; i < processors; i++) {
-                                       templateLines.push_back(new linePair());
-                                       templateLines[i]->start = int (sqrt(float(i)/float(processors)) * templateSeqs.size());
-                                       templateLines[i]->end = int (sqrt(float(i+1)/float(processors)) * templateSeqs.size());
+                       //update spotMap
+                       map<int, int> newMap;
+                       int spot = 0;
+                       
+                       for (int i = 0; i < filterString.length(); i++) {
+                               if (filterString[i] == '1') {
+                                       //add to newMap
+                                       newMap[spot] = spotMap[i];
+                                       spot++;  
                                }
                        }
-               #else
-                       lines.push_back(new linePair(0, numSeqs));
-                       templateLines.push_back(new linePair(0, templateSeqs.size()));
-               #endif
-       
-               distCalc = new ignoreGaps();
-               
-               //find closest
-               if (processors == 1) { 
-                       mothurOut("Finding top matches for sequences... "); cout.flush();
-                       closest = findClosest(lines[0]->start, lines[0]->end, numWanted);
-                       mothurOut("Done."); mothurOutEndLine();
-               }else {         createProcessesClosest();               }
+                       spotMap = newMap;
+               }
+
+               //trim sequences - this follows ccodes remove_extra_gaps 
+               trimSequences(query);
+               if (m->control_pressed) {  return 0;  }
+               
+               //windows are equivalent to words - ccode paper recommends windows are between 5% and 20% on alignment length().  
+               //Our default will be 10% and we will warn if user tries to use a window above or below these recommendations
+               windows = findWindows();  
+               if (m->control_pressed) {  return 0;  }
 
+               //remove sequences that are more than 20% different and less than 0.5% different - may want to allow user to specify this later 
+               removeBadReferenceSeqs(closest);
+               if (m->control_pressed) {  return 0;  }
+               
+               //find the averages for each querys references
+               getAverageRef(closest);  //fills sumRef, averageRef, sumSquaredRef and refCombo.
+               getAverageQuery(closest, query);  //fills sumQuery, averageQuery, sumSquaredQuery.
+               if (m->control_pressed) {  return 0;  }                 
+               
+               //find the averages for each querys references 
+               findVarianceRef();  //fills varRef and sdRef also sets minimum error rate to 0.001 to avoid divide by 0.
+               if (m->control_pressed) {  return 0;  } 
+                       
+               //find the averages for the query 
+               findVarianceQuery();  //fills varQuery and sdQuery also sets minimum error rate to 0.001 to avoid divide by 0.
+               if (m->control_pressed) {  return 0;  }
+                                       
+               determineChimeras();  //fills anova, isChimericConfidence, isChimericTStudent and isChimericANOVA. 
+               if (m->control_pressed) {  return 0;  }
+               
+               return 0;
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "getChimeras");
+               exit(1);
+       }
+}
+/***************************************************************************************************************/
+//ccode algo says it does this to "Removes the initial and final gaps to avoid biases due to incomplete sequences."
+void Ccode::trimSequences(Sequence* query) {
+       try {
+               
+               int frontPos = 0;  //should contain first position in all seqs that is not a gap character
+               int rearPos = query->getAligned().length();
                
+               //********find first position in closest seqs that is a non gap character***********//
+               //find first position all query seqs that is a non gap character
                for (int i = 0; i < closest.size(); i++) {
-                       cout << querySeqs[i]->getName() << ": ";
-                       for (int j = 0; j < closest[i].size(); j++) {
                        
-                               cout << closest[i][j]->getName() << '\t';
+                       string aligned = closest[i].seq->getAligned();
+                       int pos = 0;
+                       
+                       //find first spot in this seq
+                       for (int j = 0; j < aligned.length(); j++) {
+                               if (isalpha(aligned[j])) {
+                                       pos = j;
+                                       break;
+                               }
                        }
-                       cout << endl;
+                       
+                       //save this spot if it is the farthest
+                       if (pos > frontPos) { frontPos = pos; }
                }
+               
+               //find first position all querySeq[query] that is a non gap character
+               string aligned = query->getAligned();
+               int pos = 0;
                        
-               //free memory
-               for (int i = 0; i < lines.size(); i++)                                  {       delete lines[i];                                }
-               for (int i = 0; i < templateLines.size(); i++)                  {       delete templateLines[i];                }
+               //find first spot in this seq
+               for (int j = 0; j < aligned.length(); j++) {
+                       if (isalpha(aligned[j])) {
+                               pos = j;
+                               break;
+                       }
+               }
+               
+               //save this spot if it is the farthest
+               if (pos > frontPos) { frontPos = pos; }
+               
+               
+               //********find last position in closest seqs that is a non gap character***********//
+               for (int i = 0; i < closest.size(); i++) {
+                       
+                       string aligned = closest[i].seq->getAligned();
+                       int pos = aligned.length();
+                       
+                       //find first spot in this seq
+                       for (int j = aligned.length()-1; j >= 0; j--) {
+                               if (isalpha(aligned[j])) {
+                                       pos = j;
+                                       break;
+                               }
+                       }
                        
+                       //save this spot if it is the farthest
+                       if (pos < rearPos) { rearPos = pos; }
+               }
+               
+               //find last position all querySeqs[query] that is a non gap character
+               aligned = query->getAligned();
+               pos = aligned.length();
+               
+               //find first spot in this seq
+               for (int j = aligned.length()-1; j >= 0; j--) {
+                       if (isalpha(aligned[j])) {
+                               pos = j;
+                               break;
+                       }
+               }
+               
+               //save this spot if it is the farthest
+               if (pos < rearPos) { rearPos = pos; }
+
+               
+               //check to make sure that is not whole seq
+               if ((rearPos - frontPos - 1) <= 0) {  m->mothurOut("Error, when I trim your sequences, the entire sequence is trimmed."); m->mothurOutEndLine(); exit(1);  }
+               
+               map<int, int> tempTrim;
+               tempTrim[frontPos] = rearPos;
+               
+               //save trimmed locations
+               trim = tempTrim;
+                                               
+               //update spotMask
+               map<int, int> newMap;
+               int spot = 0;
+               
+               for (int i = frontPos; i < rearPos; i++) {
+                       //add to newMap
+                       newMap[spot] = spotMap[i];
+                       spot++;  
+               }
+               spotMap = newMap;
        }
        catch(exception& e) {
-               errorOut(e, "Ccode", "getChimeras");
+               m->errorOut(e, "Ccode", "trimSequences");
                exit(1);
        }
 }
-/***************************************************************************************************************
+/***************************************************************************************************************/
 vector<int> Ccode::findWindows() {
        try {
                
                vector<int> win; 
+               it = trim.begin();
                
-               if (increment > querySeqs[0]->getAligned().length()) {  mothurOut("You have selected an increment larger than the length of your sequences.  I will use the default of 25.");  increment = 25; }
+               int length = it->second - it->first;
+       
+               //default is wanted = 10% of total length
+               if (windowSizes > length) { 
+                       m->mothurOut("You have slected a window larger than your sequence length after all filters, masks and trims have been done. I will use the default 10% of sequence length.");
+                       windowSizes = length / 10;
+               }else if (windowSizes == 0) { windowSizes = length / 10;  }
+               else if (windowSizes > (length * 0.20)) {
+                       m->mothurOut("You have selected a window that is larger than 20% of your sequence length.  This is not recommended, but I will continue anyway."); m->mothurOutEndLine();
+               }else if (windowSizes < (length * 0.05)) {
+                       m->mothurOut("You have selected a window that is smaller than 5% of your sequence length.  This is not recommended, but I will continue anyway."); m->mothurOutEndLine();
+               }
+               
+               //save starting points of each window
+               for (int m = it->first;  m < (it->second-windowSizes); m+=windowSizes) {  win.push_back(m);  }
+               
+               //save last window
+               if (win[win.size()-1] < (it->first+length)) {
+                       win.push_back(win[win.size()-1]+windowSizes); // ex. string length is 115, window is 25, without this you would get 0, 25, 50, 75
+               }                                                                                                                                                                                                       //with this you would get 1,25,50,75,100
                
-               for (int m = increment;  m < (querySeqs[0]->getAligned().length() - increment); m+=increment) {  win.push_back(m);  }
-
                return win;
-       
        }
        catch(exception& e) {
-               errorOut(e, "Ccode", "findWindows");
+               m->errorOut(e, "Ccode", "findWindows");
                exit(1);
        }
 }
-*/
 //***************************************************************************************************************
-vector< vector<Sequence*> > Ccode::findClosest(int start, int end, int numWanted) {
-       try{
-       
-               vector< vector<Sequence*> > topMatches;  topMatches.resize(querySeqs.size());
+int Ccode::getDiff(string seqA, string seqB) {
+       try {
+               
+               int numDiff = 0;
+               
+               for (int i = 0; i < seqA.length(); i++) {
+                       //if you are both not gaps
+                       //if (isalpha(seqA[i]) && isalpha(seqA[i])) {
+                               //are you different
+                               if (seqA[i] != seqB[i]) { 
+                                        int ok; /* ok=1 means equivalent base. Checks for degenerate bases */
+
+                                       /* the char in base_a and base_b have been checked and they are different */
+                                       if ((seqA[i] == 'N') && (seqB[i] != '-')) ok = 1;
+                                       else if ((seqB[i] == 'N') && (seqA[i] != '-')) ok = 1;
+                                       else if ((seqA[i] == 'Y') && ((seqB[i] == 'C') || (seqB[i] == 'T'))) ok = 1;
+                                       else if ((seqB[i] == 'Y') && ((seqA[i] == 'C') || (seqA[i] == 'T'))) ok = 1;
+                                       else if ((seqA[i] == 'R') && ((seqB[i] == 'G') || (seqB[i] == 'A'))) ok = 1;
+                                       else if ((seqB[i] == 'R') && ((seqA[i] == 'G') || (seqA[i] == 'A'))) ok = 1;
+                                       else if ((seqA[i] == 'S') && ((seqB[i] == 'C') || (seqB[i] == 'G'))) ok = 1;
+                                       else if ((seqB[i] == 'S') && ((seqA[i] == 'C') || (seqA[i] == 'G'))) ok = 1;
+                                       else if ((seqA[i] == 'W') && ((seqB[i] == 'T') || (seqB[i] == 'A'))) ok = 1;
+                                       else if ((seqB[i] == 'W') && ((seqA[i] == 'T') || (seqA[i] == 'A'))) ok = 1;
+                                       else if ((seqA[i] == 'M') && ((seqB[i] == 'A') || (seqB[i] == 'C'))) ok = 1;
+                                       else if ((seqB[i] == 'M') && ((seqA[i] == 'A') || (seqA[i] == 'C'))) ok = 1;
+                                       else if ((seqA[i] == 'K') && ((seqB[i] == 'T') || (seqB[i] == 'G'))) ok = 1;
+                                       else if ((seqB[i] == 'K') && ((seqA[i] == 'T') || (seqA[i] == 'G'))) ok = 1;
+                                       else if ((seqA[i] == 'V') && ((seqB[i] == 'C') || (seqB[i] == 'A') || (seqB[i] == 'G'))) ok = 1;
+                                       else if ((seqB[i] == 'V') && ((seqA[i] == 'C') || (seqA[i] == 'A') || (seqA[i] == 'G'))) ok = 1;
+                                       else if ((seqA[i] == 'H') && ((seqB[i] == 'T') || (seqB[i] == 'A') || (seqB[i] == 'C'))) ok = 1;
+                                       else if ((seqB[i] == 'H') && ((seqA[i] == 'T') || (seqA[i] == 'A') || (seqA[i] == 'C'))) ok = 1;
+                                       else if ((seqA[i] == 'D') && ((seqB[i] == 'T') || (seqB[i] == 'A') || (seqB[i] == 'G'))) ok = 1;
+                                       else if ((seqB[i] == 'D') && ((seqA[i] == 'T') || (seqA[i] == 'A') || (seqA[i] == 'G'))) ok = 1;
+                                       else if ((seqA[i] == 'B') && ((seqB[i] == 'C') || (seqB[i] == 'T') || (seqB[i] == 'G'))) ok = 1;
+                                       else if ((seqB[i] == 'B') && ((seqA[i] == 'C') || (seqA[i] == 'T') || (seqA[i] == 'G'))) ok = 1;
+                                       else ok = 0;  /* the bases are different and not equivalent */
+                                       
+                                       //check if they are both blanks
+                                       if ((seqA[i] == '.') && (seqB[i] == '-')) ok = 1;
+                                       else if ((seqB[i] == '.') && (seqA[i] == '-')) ok = 1;
+                                       
+                                       if (ok == 0) {  numDiff++;  }
+                               }
+                       //}
+               }
+               
+               return numDiff;
        
-               float smallestOverall, smallestLeft, smallestRight;
-               smallestOverall = 1000;  smallestLeft = 1000;  smallestRight = 1000;
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "getDiff");
+               exit(1);
+       }
+}
+//***************************************************************************************************************
+//tried to make this look most like ccode original implementation
+void Ccode::removeBadReferenceSeqs(vector<SeqDist>& seqs) {
+       try {
+               
+               vector< vector<int> > numDiffBases;
+               numDiffBases.resize(seqs.size());
+               //initialize to 0
+               for (int i = 0; i < numDiffBases.size(); i++) { numDiffBases[i].resize(seqs.size(),0); }
+               
+               it = trim.begin();
+               int length = it->second - it->first;
                
-               //for each sequence in querySeqs - find top matches to use as reference
-               for(int j = start; j < end; j++){
+               //calc differences from each sequence to everyother seq in the set
+               for (int i = 0; i < seqs.size(); i++) {
                        
-                       Sequence query = *(querySeqs[j]);
+                       string seqA = seqs[i].seq->getAligned().substr(it->first, length);
                        
-                       vector<SeqDist> distances;
+                       //so you don't calc i to j and j to i since they are the same
+                       for (int j = 0; j < i; j++) {
+                               
+                               string seqB = seqs[j].seq->getAligned().substr(it->first, length);
+                               
+                               //compare strings
+                               int numDiff = getDiff(seqA, seqB);
+                               
+                               numDiffBases[i][j] = numDiff;
+                               numDiffBases[j][i] = numDiff;
+                       }
+               }
+               
+               //initailize remove to 0
+               vector<int> remove;  remove.resize(seqs.size(), 0);
+               float top = ((20*length) / (float) 100);
+               float bottom = ((0.5*length) / (float) 100);
+               
+               //check each numDiffBases and if any are higher than threshold set remove to 1 so you can remove those seqs from the closest set
+               for (int i = 0; i < numDiffBases.size(); i++) {
+                       for (int j = 0; j < i; j++) {   
+                               //are you more than 20% different
+                               if (numDiffBases[i][j] > top)           {  remove[j] = 1;  }
+                               //are you less than 0.5% different
+                               if (numDiffBases[i][j] < bottom)        {  remove[j] = 1;  }
+                       }
+               }
+               
+               int numSeqsLeft = 0;
+               
+               //count seqs that are not going to be removed
+               for (int i = 0; i < remove.size(); i++) {  
+                       if (remove[i] == 0)  { numSeqsLeft++;  }
+               }
+               
+               //if you have enough then remove bad ones
+               if (numSeqsLeft >= 3) {
+                       vector<SeqDist> goodSeqs;
+                       //remove bad seqs
+                       for (int i = 0; i < remove.size(); i++) {
+                               if (remove[i] == 0) { 
+                                       goodSeqs.push_back(seqs[i]);
+                               }
+                       }
                        
-                       //calc distance to each sequence in template seqs
-                       for (int i = 0; i < templateSeqs.size(); i++) {
+                       seqs = goodSeqs;
                        
-                               Sequence ref = *(templateSeqs[i]); 
-                                       
-                               //find overall dist
-                               distCalc->calcDist(query, ref);
-                               float dist = distCalc->getDist();       
-                               
-                               //save distance
-                               SeqDist temp;
-                               temp.seq = templateSeqs[i];
-                               temp.dist = dist;
+               }else { //warn, but dont remove any
+                       m->mothurOut(querySeq->getName() + " does not have an adaquate number of reference sequences that are within 20% and 0.5% similarity.  I will continue, but please check."); m->mothurOutEndLine();  
+               }
 
-                               distances.push_back(temp);
-                       }
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "removeBadReferenceSeqs");
+               exit(1);
+       }
+}
+//***************************************************************************************************************
+//makes copy of templateseq for filter
+vector<SeqDist>  Ccode::findClosest(Sequence* q, int numWanted) {
+       try{
+       
+               vector<SeqDist>  topMatches;  
+               
+               Sequence query = *(q);
                        
-                       sort(distances.begin(), distances.end(), compareSeqDist);
+               //calc distance to each sequence in template seqs
+               for (int i = 0; i < templateSeqs.size(); i++) {
                        
-                       //save the number of top matches wanted
-                       for (int h = 0; h < numWanted; h++) {
-                               topMatches[j].push_back(distances[h].seq);
-                       }
+                       Sequence ref = *(templateSeqs[i]); 
+                                       
+                       //find overall dist
+                       distCalc->calcDist(query, ref);
+                       float dist = distCalc->getDist();       
+                               
+                       //save distance
+                       SeqDist temp;
+                       temp.seq = new Sequence(templateSeqs[i]->getName(), templateSeqs[i]->getAligned());
+                       temp.dist = dist;
+
+                       topMatches.push_back(temp);
                }
                        
+               sort(topMatches.begin(), topMatches.end(), compareSeqDist);
+               
+               for (int i = numWanted; i < topMatches.size(); i++) {  delete topMatches[i].seq;  }
+               
+               topMatches.resize(numWanted);
+                       
                return topMatches;
 
        }
        catch(exception& e) {
-               errorOut(e, "Ccode", "findClosestSides");
+               m->errorOut(e, "Ccode", "findClosestSides");
                exit(1);
        }
 }
 /**************************************************************************************************/
-void Ccode::createProcessesClosest() {
+//find the distances from each reference sequence to every other reference sequence for each window for this query
+void Ccode::getAverageRef(vector<SeqDist> ref) {
        try {
-#if defined (__APPLE__) || (__MACH__) || (linux) || (__linux)
-               int process = 0;
-               vector<int> processIDS;
-               
-               //loop through and create all the processes you want
-               while (process != processors) {
-                       int pid = fork();
-                       
-                       if (pid > 0) {
-                               processIDS.push_back(pid);  
-                               process++;
-                       }else if (pid == 0){
+               
+               vector< vector< vector<int> > >  diffs;  //diffs[0][1][2] is the number of differences between ref seq 0 and ref seq 1 at window 2.
+               
+               //initialize diffs vector
+               diffs.resize(ref.size());
+               for (int i = 0; i < diffs.size(); i++) {  
+                       diffs[i].resize(ref.size());
+                       for (int j = 0; j < diffs[i].size(); j++) {
+                               diffs[i][j].resize(windows.size(), 0);
+                       }
+               }
+               
+               it = trim.begin();
                                
-                               mothurOut("Finding top matches for sequences " + toString(lines[process]->start) + " to " + toString(lines[process]->end)); mothurOutEndLine();
-                               closest = findClosest(lines[process]->start, lines[process]->end, numWanted);
-                               mothurOut("Done finding top matches for sequences " +  toString(lines[process]->start) + " to " + toString(lines[process]->end)); mothurOutEndLine();
+               //find the distances from each reference sequence to every other reference sequence for each window for this query              
+               for (int i = 0; i < ref.size(); i++) {
+                       
+                       string refI = ref[i].seq->getAligned();
+                       
+                       //j<i, so you don't find distances from i to j and then j to i.
+                       for (int j = 0; j < i; j++) {
+                       
+                               string refJ = ref[j].seq->getAligned();
+                       
+                               for (int k = 0; k < windows.size(); k++) {
+                                       
+                                       string refIWindowk, refJWindowk;
+                                       
+                                       if (k < windows.size()-1) {
+                                               //get window strings
+                                               refIWindowk = refI.substr(windows[k], windowSizes);
+                                               refJWindowk = refJ.substr(windows[k], windowSizes);
+                                       }else { //last window may be smaller than rest - see findwindows
+                                               //get window strings
+                                               refIWindowk = refI.substr(windows[k], (it->second-windows[k]));
+                                               refJWindowk = refJ.substr(windows[k], (it->second-windows[k]));
+                                       }
+                                       
+                                       //find differences
+                                       int diff = getDiff(refIWindowk, refJWindowk);
+
+                                       //save differences in [i][j][k] and [j][i][k] since they are the same
+                                       diffs[i][j][k] = diff;
+                                       diffs[j][i][k] = diff;
+
+                               }//k
                                
-                               //write out data to file so parent can read it
-                               ofstream out;
-                               string s = toString(getpid()) + ".temp";
-                               openOutputFile(s, out);
+                       }//j
+               
+               }//i
+               
+               //initialize sumRef for this query 
+               sumRef.resize(windows.size(), 0);
+               sumSquaredRef.resize(windows.size(), 0);
+               averageRef.resize(windows.size(), 0);
+               
+               //find the sum of the differences for hte reference sequences
+               for (int i = 0; i < diffs.size(); i++) {
+                       for (int j = 0; j < i; j++) {
+                       
+                               //increment this querys reference sequences combos
+                               refCombo++;
                                
-                               //output pairs
-                               for (int i = lines[process]->start; i < lines[process]->end; i++) {
-                                        out << closest[i].size() << endl;
-                                        for (int j = 0; j < closest[i].size(); j++) {
-                                               closest[i][j]->printSequence(out);
-                                        }
-                               }
-                               out.close();
+                               for (int k = 0; k < diffs[i][j].size(); k++) {
+                                       sumRef[k] += diffs[i][j][k];
+                                       sumSquaredRef[k] += (diffs[i][j][k]*diffs[i][j][k]);
+                               }//k
                                
-                               exit(0);
-                       }else { mothurOut("unable to spawn the necessary processes."); mothurOutEndLine(); exit(0); }
+                       }//j
+               }//i
+
+               
+               //find the average of the differences for the references for each window
+               for (int i = 0; i < windows.size(); i++) {
+                       averageRef[i] = sumRef[i] / (float) refCombo;
+               }
+               
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "getAverageRef");
+               exit(1);
+       }
+}
+/**************************************************************************************************/
+void Ccode::getAverageQuery (vector<SeqDist> ref, Sequence* query) {
+       try {
+       
+               vector< vector<int> >  diffs;  //diffs[1][2] is the number of differences between querySeqs[query] and ref seq 1 at window 2.
+               
+               //initialize diffs vector
+               diffs.resize(ref.size());
+               for (int j = 0; j < diffs.size(); j++) {
+                       diffs[j].resize(windows.size(), 0);
                }
                
-               //force parent to wait until all the processes are done
-               for (int i=0;i<processors;i++) { 
-                       int temp = processIDS[i];
-                       wait(&temp);
+               it = trim.begin();
+                                                       
+               string refQuery = query->getAligned();
+                        
+               //j<i, so you don't find distances from i to j and then j to i.
+               for (int j = 0; j < ref.size(); j++) {
+                        
+                        string refJ = ref[j].seq->getAligned();
+                        
+                        for (int k = 0; k < windows.size(); k++) {
+                                       
+                                       string QueryWindowk, refJWindowk;
+                                       
+                                       if (k < windows.size()-1) {
+                                               //get window strings
+                                               QueryWindowk = refQuery.substr(windows[k], windowSizes);
+                                               refJWindowk = refJ.substr(windows[k], windowSizes);                                     
+                                       }else { //last window may be smaller than rest - see findwindows
+                                               //get window strings
+                                               QueryWindowk = refQuery.substr(windows[k], (it->second-windows[k]));
+                                               refJWindowk = refJ.substr(windows[k], (it->second-windows[k]));
+                                       }
+                                       
+                                       //find differences
+                                       int diff = getDiff(QueryWindowk, refJWindowk);
+                                       
+                                       //save differences 
+                                       diffs[j][k] = diff;
+                        
+                        }//k
+               }//j
+                        
+               
+               //initialize sumRef for this query 
+               sumQuery.resize(windows.size(), 0);
+               sumSquaredQuery.resize(windows.size(), 0);
+               averageQuery.resize(windows.size(), 0);
+               
+               //find the sum of the differences 
+               for (int j = 0; j < diffs.size(); j++) {
+                       for (int k = 0; k < diffs[j].size(); k++) {
+                               sumQuery[k] += diffs[j][k];
+                               sumSquaredQuery[k] += (diffs[j][k]*diffs[j][k]);
+                       }//k
+               }//j
+               
+               
+               //find the average of the differences for the references for each window
+               for (int i = 0; i < windows.size(); i++) {
+                       averageQuery[i] = sumQuery[i] / (float) ref.size();
                }
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "getAverageQuery");
+               exit(1);
+       }
+}
+/**************************************************************************************************/
+void Ccode::findVarianceRef() {
+       try {
                
-               //get data created by processes
-               for (int i=0;i<processors;i++) { 
-                       ifstream in;
-                       string s = toString(processIDS[i]) + ".temp";
-                       openInputFile(s, in);
+               varRef.resize(windows.size(), 0);
+               sdRef.resize(windows.size(), 0);
+               
+               //for each window
+               for (int i = 0; i < windows.size(); i++) {
+                       varRef[i] = (sumSquaredRef[i] - ((sumRef[i]*sumRef[i])/(float)refCombo)) / (float)(refCombo-1);
+                       sdRef[i] = sqrt(varRef[i]);
                        
-                       //get pairs
-                       for (int k = lines[i]->start; k < lines[i]->end; k++) {
-                               int size;
-                               in >> size;
-                               gobble(in);
-                               
-                               vector<Sequence*> tempVector;
+                       //set minimum error rate to 0.001 - to avoid potential divide by zero - not sure if this is necessary but it follows ccode implementation
+                       if (averageRef[i] < 0.001)                      {       averageRef[i] = 0.001;          }
+                       if (sumRef[i] < 0.001)                          {       sumRef[i] = 0.001;                      }
+                       if (varRef[i] < 0.001)                          {       varRef[i] = 0.001;                      }
+                       if (sumSquaredRef[i] < 0.001)           {       sumSquaredRef[i] = 0.001;       }
+                       if (sdRef[i] < 0.001)                           {       sdRef[i] = 0.001;                       }
                                
-                               for (int j = 0; j < size; j++) {
-                               
-                                       Sequence* temp = new Sequence(in);
-                                       gobble(in);
-                                               
-                                       tempVector.push_back(temp);
-                               }
+               }
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "findVarianceRef");
+               exit(1);
+       }
+}
+/**************************************************************************************************/
+void Ccode::findVarianceQuery() {
+       try {
+               varQuery.resize(windows.size(), 0);
+               sdQuery.resize(windows.size(), 0);
+               
+               //for each window
+               for (int i = 0; i < windows.size(); i++) {
+                       varQuery[i] = (sumSquaredQuery[i] - ((sumQuery[i]*sumQuery[i])/(float) closest.size())) / (float) (closest.size()-1);
+                       sdQuery[i] = sqrt(varQuery[i]);
+                       
+                       //set minimum error rate to 0.001 - to avoid potential divide by zero - not sure if this is necessary but it follows ccode implementation
+                       if (averageQuery[i] < 0.001)                    {       averageQuery[i] = 0.001;                }
+                       if (sumQuery[i] < 0.001)                                {       sumQuery[i] = 0.001;                    }
+                       if (varQuery[i] < 0.001)                                {       varQuery[i] = 0.001;                    }
+                       if (sumSquaredQuery[i] < 0.001)         {       sumSquaredQuery[i] = 0.001;     }
+                       if (sdQuery[i] < 0.001)                         {       sdQuery[i] = 0.001;                     }
+               }
+
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "findVarianceQuery");
+               exit(1);
+       }
+}
+/**************************************************************************************************/
+void Ccode::determineChimeras() {
+       try {
+               
+               isChimericConfidence.resize(windows.size(), false);
+               isChimericTStudent.resize(windows.size(), false);
+               isChimericANOVA.resize(windows.size(), false);
+               anova.resize(windows.size());
+
+               
+               //for each window
+               for (int i = 0; i < windows.size(); i++) {
+               
+                       //get confidence limits
+                       float t = getT(closest.size()-1);  //how many seqs you are comparing to this querySeq
+                       float dsUpper = (averageQuery[i] + (t * sdQuery[i])) / averageRef[i]; 
+                       float dsLower = (averageQuery[i] - (t * sdQuery[i])) / averageRef[i]; 
+               
+                       if ((dsUpper > 1.0) && (dsLower > 1.0) && (averageQuery[i] > averageRef[i])) {  /* range does not include 1 */
+                                       isChimericConfidence[i] = true;   /* significantly higher at P<0.05 */ 
+
+                       }
+                       
+                       //student t test
+                       int degreeOfFreedom = refCombo + closest.size() - 2;
+                       float denomForT = (((refCombo-1) * varQuery[i] + (closest.size() - 1) * varRef[i]) / (float) degreeOfFreedom) * ((refCombo + closest.size()) / (float) (refCombo * closest.size()));    /* denominator, without sqrt(), for ts calculations */
                                
-                               closest[k] = tempVector;
+                       float ts = fabs((averageQuery[i] - averageRef[i]) / (sqrt(denomForT)));  /* value of ts for t-student test */   
+                       t = getT(degreeOfFreedom);
+       
+                       if ((ts >= t) && (averageQuery[i] > averageRef[i])) {   
+                               isChimericTStudent[i] = true;   /* significantly higher at P<0.05 */ 
                        }
+               
+                       //anova test
+                       float value1 = sumQuery[i] + sumRef[i];
+                       float value2 = sumSquaredQuery[i] + sumSquaredRef[i];
+                       float value3 = ((sumQuery[i]*sumQuery[i]) / (float) (closest.size())) + ((sumRef[i] * sumRef[i]) / (float) refCombo);
+                       float value4 = (value1 * value1) / ( (float) (closest.size() + refCombo) );
+                       float value5 = value2 - value4;
+                       float value6 = value3 - value4;
+                       float value7 = value5 - value6;
+                       float value8 = value7 / ((float) degreeOfFreedom);
+                       float anovaValue = value6 / value8;
                        
-                       in.close();
-                       remove(s.c_str());
-               }
+                       float f = getF(degreeOfFreedom);
+                       
+                        if ((anovaValue >= f) && (averageQuery[i] > averageRef[i]))  {
+                      isChimericANOVA[i] = true;   /* significant P<0.05 */
+               }
+                       
+                       if (isnan(anovaValue) || isinf(anovaValue)) { anovaValue = 0.0; }
                        
+                       anova[i] = anovaValue;
+               }
+               
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "determineChimeras");
+               exit(1);
+       }
+}
+/**************************************************************************************************/   
+float Ccode::getT(int numseq) {
+       try {
        
-#else
-               closest = findClosest(lines[0]->start, lines[0]->end, numWanted);
-#endif 
-
+               float tvalue = 0;
+               
+               /* t-student critical values for different degrees of freedom and alpha 0.1 in one-tail tests (equivalent to 0.05) */
+               if (numseq > 120) tvalue = 1.645;
+               else if (numseq > 60) tvalue = 1.658;
+        else if (numseq > 40) tvalue = 1.671;
+        else if (numseq > 30) tvalue = 1.684;
+        else if (numseq > 29) tvalue = 1.697;
+        else if (numseq > 28) tvalue = 1.699;
+        else if (numseq > 27) tvalue = 1.701;
+        else if (numseq > 26) tvalue = 1.703;
+        else if (numseq > 25) tvalue = 1.706;
+        else if (numseq > 24) tvalue = 1.708;
+        else if (numseq > 23) tvalue = 1.711;
+        else if (numseq > 22) tvalue = 1.714;
+        else if (numseq > 21) tvalue = 1.717;
+        else if (numseq > 20) tvalue = 1.721;
+        else if (numseq > 19) tvalue = 1.725;
+        else if (numseq > 18) tvalue = 1.729;
+        else if (numseq > 17) tvalue = 1.734;
+        else if (numseq > 16) tvalue = 1.740;
+        else if (numseq > 15) tvalue = 1.746;
+        else if (numseq > 14) tvalue = 1.753;
+        else if (numseq > 13) tvalue = 1.761;
+        else if (numseq > 12) tvalue = 1.771;
+        else if (numseq > 11) tvalue = 1.782;
+        else if (numseq > 10) tvalue = 1.796;
+        else if (numseq > 9) tvalue = 1.812;
+        else if (numseq > 8) tvalue = 1.833;
+        else if (numseq > 7) tvalue = 1.860;
+        else if (numseq > 6) tvalue = 1.895;
+        else if (numseq > 5) tvalue = 1.943;
+        else if (numseq > 4) tvalue = 2.015;
+        else if (numseq > 3) tvalue = 2.132;
+        else if (numseq > 2) tvalue = 2.353;
+        else if (numseq > 1) tvalue = 2.920;
+               else if (numseq <= 1) {
+                       m->mothurOut("Two or more reference sequences are required, your data will be flawed.\n"); m->mothurOutEndLine();
+               }
+               
+               return tvalue;
        }
        catch(exception& e) {
-               errorOut(e, "Ccode", "createProcessesClosest");
+               m->errorOut(e, "Ccode", "getT");
+               exit(1);
+       }
+}
+/**************************************************************************************************/   
+float Ccode::getF(int numseq) {
+       try {
+       
+               float fvalue = 0;
+               
+                /* F-Snedecor critical values for v1=1 and different degrees of freedom v2 and alpha 0.05 */
+        if (numseq > 120) fvalue = 3.84;
+        else if (numseq > 60) fvalue = 3.92;
+        else if (numseq > 40) fvalue = 4.00;
+        else if (numseq > 30) fvalue = 4.08;
+        else if (numseq > 29) fvalue = 4.17;
+        else if (numseq > 28) fvalue = 4.18;
+        else if (numseq > 27) fvalue = 4.20;
+        else if (numseq > 26) fvalue = 4.21;
+        else if (numseq > 25) fvalue = 4.23;
+        else if (numseq > 24) fvalue = 4.24;
+        else if (numseq > 23) fvalue = 4.26;
+        else if (numseq > 22) fvalue = 4.28;
+        else if (numseq > 21) fvalue = 4.30;
+        else if (numseq > 20) fvalue = 4.32;
+        else if (numseq > 19) fvalue = 4.35;
+        else if (numseq > 18) fvalue = 4.38;
+        else if (numseq > 17) fvalue = 4.41;
+        else if (numseq > 16) fvalue = 4.45;
+        else if (numseq > 15) fvalue = 4.49;
+        else if (numseq > 14) fvalue = 4.54;
+        else if (numseq > 13) fvalue = 4.60;
+        else if (numseq > 12) fvalue = 4.67;
+        else if (numseq > 11) fvalue = 4.75;
+        else if (numseq > 10) fvalue = 4.84;
+        else if (numseq > 9) fvalue = 4.96;
+        else if (numseq > 8) fvalue = 5.12;
+        else if (numseq > 7) fvalue = 5.32;
+        else if (numseq > 6) fvalue = 5.59;
+        else if (numseq > 5) fvalue = 5.99;
+        else if (numseq > 4) fvalue = 6.61;
+        else if (numseq > 3) fvalue = 7.71;
+        else if (numseq > 2) fvalue = 10.1;
+        else if (numseq > 1) fvalue = 18.5;
+        else if (numseq > 0) fvalue = 161;
+               else if (numseq <= 0) {
+                       m->mothurOut("Two or more reference sequences are required, your data will be flawed.\n"); m->mothurOutEndLine();
+        }
+               
+               return fvalue;
+       }
+       catch(exception& e) {
+               m->errorOut(e, "Ccode", "getF");
                exit(1);
        }
 }
-
 //***************************************************************************************************************
 
+
+