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diff --git a/splitmatrix.cpp b/splitmatrix.cpp
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+/*
+ *  splitmatrix.cpp
+ *  Mothur
+ *
+ *  Created by westcott on 5/19/10.
+ *  Copyright 2010 Schloss Lab. All rights reserved.
+ *
+ */
+
+#include "splitmatrix.h"
+#include "phylotree.h"
+#include "distancecommand.h"
+#include "seqsummarycommand.h"
+
+/***********************************************************************/
+
+SplitMatrix::SplitMatrix(string distfile, string name, string tax, float c, string t, bool l){
+       m = MothurOut::getInstance();
+       distFile = distfile;
+       cutoff = c;
+       namefile = name;
+       method = t;
+       taxFile = tax;
+       large = l;
+}
+/***********************************************************************/
+
+SplitMatrix::SplitMatrix(string ffile, string name, string tax, float c, float cu, string t, int p, string output){
+       m = MothurOut::getInstance();
+       fastafile = ffile;
+       namefile = name;
+       taxFile = tax;
+       cutoff = c;  //tax level cutoff
+       distCutoff = cu; //for fasta method if you are creating distance matrix you need a cutoff for that
+       method = t;
+       processors = p;
+       outputDir = output;
+}
+
+/***********************************************************************/
+
+int SplitMatrix::split(){
+       try {
+        
+               if (method == "distance") {  
+                       splitDistance();
+               }else if ((method == "classify") || (method == "fasta")) {
+                       splitClassify();
+               }else {
+                       m->mothurOut("Unknown splitting method, aborting split."); m->mothurOutEndLine();
+                       map<string, string> temp;
+                       temp[distFile] = namefile;
+                       dists.push_back(temp);
+               }
+               
+               return 0;
+       }
+       catch(exception& e) {
+               m->errorOut(e, "SplitMatrix", "split");
+               exit(1);
+       }
+}
+/***********************************************************************/
+int SplitMatrix::splitDistance(){
+       try {
+        
+               if (large)      { splitDistanceLarge(); }
+               else            { splitDistanceRAM();   }
+               
+               return 0;
+                       
+       }
+       catch(exception& e) {
+               m->errorOut(e, "SplitMatrix", "splitDistance");
+               exit(1);
+       }
+}
+
+/***********************************************************************/
+int SplitMatrix::splitClassify(){
+       try {
+               cutoff = int(cutoff);
+                               
+               map<string, int> seqGroup;
+               map<string, int>::iterator it;
+               map<string, int>::iterator it2;
+               
+               int numGroups = 0;
+               
+               //build tree from users taxonomy file
+               PhyloTree* phylo = new PhyloTree();
+               
+               ifstream in;
+               m->openInputFile(taxFile, in);
+                       
+               //read in users taxonomy file and add sequences to tree
+               string seqname, tax;
+               while(!in.eof()){
+                       in >> seqname >> tax; m->gobble(in);
+                       phylo->addSeqToTree(seqname, tax);
+               }
+               in.close();
+               
+               phylo->assignHeirarchyIDs(0);
+
+               //make sure the cutoff is not greater than maxlevel
+               if (cutoff > phylo->getMaxLevel()) { m->mothurOut("splitcutoff is greater than the longest taxonomy, using " + toString(phylo->getMaxLevel())); m->mothurOutEndLine(); cutoff = phylo->getMaxLevel(); }
+       
+               //for each node in tree
+               for (int i = 0; i < phylo->getNumNodes(); i++) {
+               
+                       //is this node within the cutoff
+                       TaxNode taxon = phylo->get(i);
+       
+                       if (taxon.level == cutoff) {//if yes, then create group containing this nodes sequences
+                               if (taxon.accessions.size() > 1) { //if this taxon just has one seq its a singleton
+                                       for (int j = 0; j < taxon.accessions.size(); j++) {
+                                               seqGroup[taxon.accessions[j]] = numGroups;
+                                       }
+                                       numGroups++;
+                               }
+                       }
+               }
+       
+               delete phylo;
+               
+               if (method == "classify") {
+                       splitDistanceFileByTax(seqGroup, numGroups);
+               }else {
+                       createDistanceFilesFromTax(seqGroup, numGroups);
+               }
+               
+               return 0;
+                       
+       }
+       catch(exception& e) {
+               m->errorOut(e, "SplitMatrix", "splitClassify");
+               exit(1);
+       }
+}
+/***********************************************************************/
+int SplitMatrix::createDistanceFilesFromTax(map<string, int>& seqGroup, int numGroups){
+       try {
+               map<string, int> copyGroups = seqGroup;
+               map<string, int>::iterator it;
+               set<string> names;
+                               
+               for (int i = 0; i < numGroups; i++) { //remove old temp files, just in case
+                       m->mothurRemove((fastafile + "." + toString(i) + ".temp"));
+               }
+                       
+               ifstream in;
+               m->openInputFile(fastafile, in);
+       
+               //parse fastafile
+               ofstream outFile;
+               while (!in.eof()) {
+                       Sequence query(in); m->gobble(in);
+                       if (query.getName() != "") {
+               
+                               it = seqGroup.find(query.getName());
+                               
+                               //save names in case no namefile is given
+                               if (namefile == "") {  names.insert(query.getName()); }
+                       
+                               if (it != seqGroup.end()) { //not singleton 
+                                       m->openOutputFileAppend((fastafile + "." + toString(it->second) + ".temp"), outFile);
+                                       query.printSequence(outFile); 
+                                       outFile.close();
+                                       
+                                       copyGroups.erase(query.getName());
+                               }
+                       }
+               }
+               in.close();
+               
+               //warn about sequence in groups that are not in fasta file
+               for(it = copyGroups.begin(); it != copyGroups.end(); it++) {
+                       m->mothurOut("ERROR: " + it->first + " is missing from your fastafile. This could happen if your taxonomy file is not unique and your fastafile is, or it could indicate and error."); m->mothurOutEndLine();
+                       exit(1);
+               }
+               
+               copyGroups.clear();
+               
+               //process each distance file
+               for (int i = 0; i < numGroups; i++) { 
+                       
+                       string options = "fasta=" + (fastafile + "." + toString(i) + ".temp") + ", processors=" + toString(processors) + ", cutoff=" + toString(distCutoff);
+                       if (outputDir != "") { options += ", outputdir=" + outputDir; }
+                       
+                       Command* command = new DistanceCommand(options);
+                       
+                       command->execute();
+                       delete command;
+                       
+                       m->mothurRemove((fastafile + "." + toString(i) + ".temp"));
+                       
+                       //remove old names files just in case
+                       m->mothurRemove((namefile + "." + toString(i) + ".temp"));
+               }
+                       
+               singleton = namefile + ".extra.temp";
+               ofstream remainingNames;
+               m->openOutputFile(singleton, remainingNames);
+               
+               bool wroteExtra = false;
+
+               ifstream bigNameFile;
+               m->openInputFile(namefile, bigNameFile);
+               
+               string name, nameList;
+               while(!bigNameFile.eof()){
+                       bigNameFile >> name >> nameList;  m->gobble(bigNameFile);
+                       
+                       //did this sequence get assigned a group
+                       it = seqGroup.find(name);
+                       
+                       if (it != seqGroup.end()) {  
+                               m->openOutputFileAppend((namefile + "." + toString(it->second) + ".temp"), outFile);
+                               outFile << name << '\t' << nameList << endl;
+                               outFile.close();
+                       }else{
+                               wroteExtra = true;
+                               remainingNames << name << '\t' << nameList << endl;
+                       }
+               }
+               bigNameFile.close();
+               
+               for(int i=0;i<numGroups;i++){
+                       string tempNameFile = namefile + "." + toString(i) + ".temp";
+                       if (outputDir == "") { outputDir = m->hasPath(fastafile); }
+                       string tempDistFile = outputDir + m->getRootName(m->getSimpleName((fastafile + "." + toString(i) + ".temp"))) + "dist";
+
+                       //if there are valid distances
+                       ifstream fileHandle;
+                       fileHandle.open(tempDistFile.c_str());
+                       if(fileHandle)  {       
+                               m->gobble(fileHandle);
+                               if (!fileHandle.eof()) {  //check for blank file - this could occur if all dists in group are above cutoff
+                                       map<string, string> temp;
+                                       temp[tempDistFile] = tempNameFile;
+                                       dists.push_back(temp);
+                               }else {
+                                       ifstream in;
+                                       m->openInputFile(tempNameFile, in);
+                               
+                                       while(!in.eof()) { 
+                                               in >> name >> nameList;  m->gobble(in);
+                                               wroteExtra = true;
+                                               remainingNames << name << '\t' << nameList << endl;
+                                       }
+                                       in.close();
+                                       m->mothurRemove(tempNameFile);
+                               }
+                       }
+                       fileHandle.close();
+               }
+               
+               remainingNames.close();
+               if (!wroteExtra) { 
+                       m->mothurRemove(singleton);
+                       singleton = "none";
+               }
+
+               if (m->control_pressed)  {  for (int i = 0; i < dists.size(); i++) { m->mothurRemove((dists[i].begin()->first)); m->mothurRemove((dists[i].begin()->second)); } dists.clear(); }
+               
+               return 0;
+       }
+       catch(exception& e) {
+               m->errorOut(e, "SplitMatrix", "createDistanceFilesFromTax");
+               exit(1);
+       }
+}
+/***********************************************************************/
+int SplitMatrix::splitDistanceFileByTax(map<string, int>& seqGroup, int numGroups){
+       try {
+               map<string, int>::iterator it;
+               map<string, int>::iterator it2;
+               
+               ifstream dFile;
+               m->openInputFile(distFile, dFile);
+               ofstream outFile;
+               
+               for (int i = 0; i < numGroups; i++) { //remove old temp files, just in case
+                       m->mothurRemove((distFile + "." + toString(i) + ".temp"));
+               }
+               
+               //for buffering the io to improve speed
+                //allow for 10 dists to be stored, then output.
+               vector<string> outputs;  outputs.resize(numGroups, "");
+               vector<int> numOutputs;  numOutputs.resize(numGroups, 0);       
+               
+               //you can have a group made, but their may be no distances in the file for this group if the taxonomy file and distance file don't match
+               //this can occur if we have converted the phylip to column, since we reduce the size at that step by using the cutoff value
+               vector<bool> validDistances;   validDistances.resize(numGroups, false); 
+               
+               //for each distance
+               while(dFile){
+                       string seqA, seqB;
+                       float dist;
+                       
+                       if (m->control_pressed) { dFile.close(); for (int i = 0; i < numGroups; i++) { m->mothurRemove((distFile + "." + toString(i) + ".temp"));       } }
+                       
+                       dFile >> seqA >> seqB >> dist;  m->gobble(dFile);
+                       
+                       //if both sequences are in the same group then they are within the cutoff
+                       it = seqGroup.find(seqA);
+                       it2 = seqGroup.find(seqB);
+                       
+                       if ((it != seqGroup.end()) && (it2 != seqGroup.end())) { //they are both not singletons 
+                               if (it->second == it2->second) { //they are from the same group so add the distance
+                                       if (numOutputs[it->second] > 30) {
+                                               m->openOutputFileAppend((distFile + "." + toString(it->second) + ".temp"), outFile);
+                                               outFile << outputs[it->second] << seqA << '\t' << seqB << '\t' << dist << endl;
+                                               outFile.close();
+                                               outputs[it->second] = "";
+                                               numOutputs[it->second] = 0;
+                                               validDistances[it->second] = true;
+                                       }else{
+                                               outputs[it->second] += seqA + '\t' + seqB + '\t' + toString(dist)  + '\n';
+                                               numOutputs[it->second]++;
+                                       }
+                               }
+                       }
+               }
+               dFile.close();
+       
+               for (int i = 0; i < numGroups; i++) { //remove old temp files, just in case
+                       m->mothurRemove((namefile + "." + toString(i) + ".temp"));
+                       
+                       //write out any remaining buffers
+                       if (numOutputs[i] > 0) {
+                               m->openOutputFileAppend((distFile + "." + toString(i) + ".temp"), outFile);
+                               outFile << outputs[i];
+                               outFile.close();
+                               outputs[i] = "";
+                               numOutputs[i] = 0;
+                               validDistances[i] = true;
+                       }
+               }
+               
+               ifstream bigNameFile;
+               m->openInputFile(namefile, bigNameFile);
+               
+               singleton = namefile + ".extra.temp";
+               ofstream remainingNames;
+               m->openOutputFile(singleton, remainingNames);
+               
+               bool wroteExtra = false;
+                                               
+               string name, nameList;
+               while(!bigNameFile.eof()){
+                       bigNameFile >> name >> nameList;  m->gobble(bigNameFile);
+                       
+                       //did this sequence get assigned a group
+                       it = seqGroup.find(name);
+                       
+                       if (it != seqGroup.end()) {  
+                               m->openOutputFileAppend((namefile + "." + toString(it->second) + ".temp"), outFile);
+                               outFile << name << '\t' << nameList << endl;
+                               outFile.close();
+                       }else{
+                               wroteExtra = true;
+                               remainingNames << name << '\t' << nameList << endl;
+                       }
+               }
+               bigNameFile.close();
+                               
+               for(int i=0;i<numGroups;i++){
+                       string tempNameFile = namefile + "." + toString(i) + ".temp";
+                       string tempDistFile = distFile + "." + toString(i) + ".temp";
+
+                       //if there are valid distances
+                       if (validDistances[i]) {
+                               map<string, string> temp;
+                               temp[tempDistFile] = tempNameFile;
+                               dists.push_back(temp);
+                       }else{
+                               ifstream in;
+                               m->openInputFile(tempNameFile, in);
+                               
+                               while(!in.eof()) { 
+                                       in >> name >> nameList;  m->gobble(in);
+                                       wroteExtra = true;
+                                       remainingNames << name << '\t' << nameList << endl;
+                               }
+                               in.close();
+                               m->mothurRemove(tempNameFile);
+                       }
+               }
+               
+               remainingNames.close();
+               
+               if (!wroteExtra) { 
+                       m->mothurRemove(singleton);
+                       singleton = "none";
+               }
+
+               if (m->control_pressed)  {  
+                       for (int i = 0; i < dists.size(); i++) { 
+                               m->mothurRemove((dists[i].begin()->first));
+                               m->mothurRemove((dists[i].begin()->second));
+                       }
+                       dists.clear();
+               }
+               
+               return 0;
+       }
+       catch(exception& e) {
+               m->errorOut(e, "SplitMatrix", "splitDistanceFileByTax");
+               exit(1);
+       }
+}
+/***********************************************************************/
+int SplitMatrix::splitDistanceLarge(){
+       try {
+               vector<set<string> > groups;
+               
+               //for buffering the io to improve speed
+                //allow for 30 dists to be stored, then output.
+               vector<string> outputs;
+               vector<int> numOutputs;
+               vector<bool> wroteOutPut;
+               
+               int numGroups = 0;
+
+               ofstream outFile;
+               ifstream dFile;
+               m->openInputFile(distFile, dFile);
+       
+               while(dFile){
+                       string seqA, seqB;
+                       float dist;
+
+                       dFile >> seqA >> seqB >> dist;
+                       
+                       if (m->control_pressed) {   dFile.close();  for(int i=0;i<numGroups;i++){       if(groups[i].size() > 0){  m->mothurRemove((distFile + "." + toString(i) + ".temp")); }  } return 0; }
+                                       
+                       if(dist < cutoff){
+                               //cout << "in cutoff: " << dist << endl;
+                               int groupIDA = -1;
+                               int groupIDB = -1;
+                               int groupID = -1;
+                               
+                               for(int i=0;i<numGroups;i++){
+                                       set<string>::iterator aIt = groups[i].find(seqA);
+                                       set<string>::iterator bIt = groups[i].find(seqB);
+                                       
+                                       if(groupIDA == -1 && aIt != groups[i].end()){//seqA is not already assigned to a group and is in group[i], so assign seqB to group[i]
+                                               groups[i].insert(seqB);
+                                               groupIDA = i;
+                                               groupID = groupIDA;
+
+                                               //cout << "in aIt: " << groupID << endl;
+       //                                      break;
+                                       }
+                                       else if(groupIDB == -1 && bIt != groups[i].end()){//seqB is not already assigned to a group and is in group[i], so assign seqA to group[i]
+                                               groups[i].insert(seqA);
+                                               groupIDB = i;
+                                               groupID = groupIDB;
+
+                                       //      cout << "in bIt: " << groupID << endl;
+       //                                      break;
+                                       }
+                               
+                                       if(groupIDA != -1 && groupIDB != -1){//both ifs above have been executed, so we need to decide who to assign them to
+                                               if(groupIDA < groupIDB){
+                                               //      cout << "A: " << groupIDA << "\t" << groupIDB << endl;
+                                                       groups[groupIDA].insert(groups[groupIDB].begin(), groups[groupIDB].end()); //merge two groups into groupIDA
+                                                       groups[groupIDB].clear(); 
+                                                       groupID = groupIDA;
+                                               }
+                                               else{
+                                               //      cout << "B: " << groupIDA << "\t" << groupIDB << endl;
+                                                       groups[groupIDB].insert(groups[groupIDA].begin(), groups[groupIDA].end()); //merge two groups into groupIDB
+                                                       groups[groupIDA].clear();  
+                                                       groupID = groupIDB;
+                                               }
+                                               break;
+                                       }
+                               }
+                               
+       //windows is gonna gag on the reuse of outFile, will need to make it local...
+                               
+                               if(groupIDA == -1 && groupIDB == -1){ //we need a new group
+                                       set<string> newGroup;
+                                       newGroup.insert(seqA);
+                                       newGroup.insert(seqB);
+                                       groups.push_back(newGroup);
+                                                                       
+                                       string tempOut = seqA + '\t' + seqB + '\t' + toString(dist) + '\n';
+                                       outputs.push_back(tempOut);
+                                       numOutputs.push_back(1);
+                                       wroteOutPut.push_back(false);
+                                       
+                                       numGroups++;
+                               }
+                               else{
+                                       string fileName = distFile + "." + toString(groupID) + ".temp";
+                                                                                       
+                                       //have we reached the max buffer size
+                                       if (numOutputs[groupID] > 60) { //write out sequence
+                                               outFile.open(fileName.c_str(), ios::app);
+                                               outFile << outputs[groupID] << seqA << '\t' << seqB << '\t' << dist << endl;
+                                               outFile.close();
+                                               
+                                               outputs[groupID] = "";
+                                               numOutputs[groupID] = 0;
+                                               wroteOutPut[groupID] = true;
+                                       }else {
+                                               outputs[groupID] +=  seqA + '\t' + seqB + '\t' + toString(dist)  + '\n';
+                                               numOutputs[groupID]++;
+                                       }
+                                       
+                                       if(groupIDA != -1 && groupIDB != -1){ //merge distance files of two groups you merged above
+                                               string row, column, distance;
+                                               if(groupIDA<groupIDB){
+                                                       
+                                                       //merge memory
+                                                       numOutputs[groupID] += numOutputs[groupIDB];
+                                                       outputs[groupID] += outputs[groupIDB];
+                                                       
+                                                       outputs[groupIDB] = "";
+                                                       numOutputs[groupIDB] = 0;
+                                                       
+                                                       //if groupB is written to file it is above buffer size so read and write to new merged file
+                                                       if (wroteOutPut[groupIDB]) {
+                                                               string fileName2 = distFile + "." + toString(groupIDB) + ".temp";
+                                                               ifstream fileB(fileName2.c_str(), ios::ate);
+                                                               
+                                                               outFile.open(fileName.c_str(), ios::app);
+                                                               
+                                                               long size;
+                                                               char* memblock;
+
+                                                               size = fileB.tellg();
+                               
+                                                               fileB.seekg (0, ios::beg);
+                                                               
+                                                               int numRead = size / 1024;
+                                                               int lastRead = size % 1024;
+
+                                                               for (int i = 0; i < numRead; i++) {
+                               
+                                                                       memblock = new char [1024];
+                                                               
+                                                                       fileB.read (memblock, 1024);
+                                                                       
+                                                                       string temp = memblock;
+                                                                       outFile << temp.substr(0, 1024);
+                                                                       
+                                                                       delete memblock;
+                                                               }
+                                                               
+                                                               memblock = new char [lastRead];
+                                                               
+                                                               fileB.read (memblock, lastRead);
+                                                               
+                                                               //not sure why but it will read more than lastRead char...??
+                                                               string temp = memblock;
+                                                               outFile << temp.substr(0, lastRead);
+                                                               delete memblock;
+                                                               
+                                                               fileB.close();
+                                                               m->mothurRemove(fileName2);
+                                                               
+                                                               //write out the merged memory
+                                                               if (numOutputs[groupID] > 60) {
+                                                                       outFile << outputs[groupID];
+                                                                       outputs[groupID] = "";
+                                                                       numOutputs[groupID] = 0;
+                                                               }
+                                                               
+                                                               outFile.close();
+                                                               
+                                                               wroteOutPut[groupID] = true;
+                                                               wroteOutPut[groupIDB] = false;
+                                                       }else{ } //just merge b's memory with a's memory 
+                                               }
+                                               else{
+                                                       numOutputs[groupID] += numOutputs[groupIDA];
+                                                       outputs[groupID] += outputs[groupIDA];
+                                                       
+                                                       outputs[groupIDA] = "";
+                                                       numOutputs[groupIDA] = 0;
+                                                       
+                                                       if (wroteOutPut[groupIDA]) {
+                                                               string fileName2 = distFile + "." + toString(groupIDA) + ".temp";
+                                                               ifstream fileB(fileName2.c_str(), ios::ate);
+                                                               
+                                                               outFile.open(fileName.c_str(), ios::app);
+                                                               
+                                                               long size;
+                                                               char* memblock;
+
+                                                               size = fileB.tellg();
+                                                                                                                       
+                                                               fileB.seekg (0, ios::beg);
+                                                               
+                                                               int numRead = size / 1024;
+                                                               int lastRead = size % 1024;
+
+                                                               for (int i = 0; i < numRead; i++) {
+                               
+                                                                       memblock = new char [1024];
+                                                               
+                                                                       fileB.read (memblock, 1024);
+                                                                       string temp = memblock;
+                                                                       outFile << temp.substr(0, 1024);
+                                                                       
+                                                                       delete memblock;
+                                                               }
+                                                               
+                                                               memblock = new char [lastRead];
+                                                               
+                                                               fileB.read (memblock, lastRead);
+                                                               
+                                                               //not sure why but it will read more than lastRead char...??
+                                                               string temp = memblock;
+                                                               outFile << temp.substr(0, lastRead);
+                                                                       
+                                                               delete memblock;
+                                                               
+                                                               fileB.close();
+                                                               m->mothurRemove(fileName2);
+                                                               
+                                                               //write out the merged memory
+                                                               if (numOutputs[groupID] > 60) {
+                                                                       outFile << outputs[groupID];
+                                                                       outputs[groupID] = "";
+                                                                       numOutputs[groupID] = 0;
+                                                               }
+                                                               
+                                                               outFile.close();
+                                                               
+                                                               wroteOutPut[groupID] = true;
+                                                               wroteOutPut[groupIDA] = false;
+                                                       }else { } //just merge memory
+                                               }                                       
+                                       }
+                               }
+                       }
+                       m->gobble(dFile);
+               }
+               dFile.close();
+               
+               for (int i = 0; i < numGroups; i++) {
+                       if (numOutputs[i] > 0) {
+                               string fileName = distFile + "." + toString(i) + ".temp";
+                               outFile.open(fileName.c_str(), ios::app);
+                               outFile << outputs[i];
+                               outFile.close();
+                       }
+               }
+
+               splitNames(groups);
+                               
+               return 0;                       
+       }
+       catch(exception& e) {
+               m->errorOut(e, "SplitMatrix", "splitDistanceLarge");
+               exit(1);
+       }
+}
+//********************************************************************************************************************
+int SplitMatrix::splitNames(vector<set<string> >& groups){
+       try {
+               int numGroups = groups.size();
+       
+               ifstream bigNameFile(namefile.c_str());
+               if(!bigNameFile){
+                       cerr << "Error: We can't open the name file\n";
+                       exit(1);
+               }
+               
+               map<string, string> nameMap;
+               string name, nameList;
+               while(bigNameFile){
+                       bigNameFile >> name >> nameList;
+                       nameMap[name] = nameList;
+                       m->gobble(bigNameFile);
+               }
+               bigNameFile.close();
+                       
+               for(int i=0;i<numGroups;i++){  //parse names file to match distance files
+                       int numSeqsInGroup = groups[i].size();
+                       
+                       if(numSeqsInGroup > 0){
+                               string fileName = namefile + "." + toString(i) + ".temp";
+                               ofstream smallNameFile(fileName.c_str(), ios::ate);
+                               
+                               for(set<string>::iterator gIt=groups[i].begin();gIt!=groups[i].end();gIt++){
+                                       map<string,string>::iterator nIt = nameMap.find(*gIt);
+                                       if (nIt != nameMap.end()) {
+                                               smallNameFile << nIt->first << '\t' << nIt->second << endl;
+                                               nameMap.erase(nIt);
+                                       }else{
+                                               m->mothurOut((*gIt) + " is in your distance file and not in your namefile.  Please correct."); m->mothurOutEndLine(); exit(1);
+                                       }
+                               }
+                               smallNameFile.close();
+                       }
+               }
+               
+               //names of singletons
+               if (nameMap.size() != 0) {
+                       singleton = namefile + ".extra.temp";
+                       ofstream remainingNames(singleton.c_str(), ios::ate);
+                       for(map<string,string>::iterator nIt=nameMap.begin();nIt!=nameMap.end();nIt++){
+                               remainingNames << nIt->first << '\t' << nIt->second << endl;
+                       }
+                       remainingNames.close();
+               }else { singleton = "none"; }
+                       
+               for(int i=0;i<numGroups;i++){
+                       if(groups[i].size() > 0){
+                               string tempNameFile = namefile + "." + toString(i) + ".temp";
+                               string tempDistFile = distFile + "." + toString(i) + ".temp";
+                               
+                               map<string, string> temp;
+                               temp[tempDistFile] = tempNameFile;
+                               dists.push_back(temp);
+                       }
+               }
+               
+               if (m->control_pressed)  {  
+                       for (int i = 0; i < dists.size(); i++) { 
+                               m->mothurRemove((dists[i].begin()->first));
+                               m->mothurRemove((dists[i].begin()->second));
+                       }
+                       dists.clear();
+               }
+               
+               return 0;
+       }
+       catch(exception& e) {
+               m->errorOut(e, "SplitMatrix", "splitNames");
+               exit(1);
+       }
+}
+//********************************************************************************************************************
+int SplitMatrix::splitDistanceRAM(){
+       try {
+               vector<set<string> > groups;
+               vector<string> outputs;
+               
+               int numGroups = 0;
+
+               ifstream dFile;
+               m->openInputFile(distFile, dFile);
+
+               while(dFile){
+                       string seqA, seqB;
+                       float dist;
+
+                       dFile >> seqA >> seqB >> dist;
+                       
+                       if (m->control_pressed) {   dFile.close();  for(int i=0;i<numGroups;i++){       if(groups[i].size() > 0){  m->mothurRemove((distFile + "." + toString(i) + ".temp")); }  } return 0; }
+                                       
+                       if(dist < cutoff){
+                               //cout << "in cutoff: " << dist << endl;
+                               int groupIDA = -1;
+                               int groupIDB = -1;
+                               int groupID = -1;
+                               
+                               for(int i=0;i<numGroups;i++){
+                                       set<string>::iterator aIt = groups[i].find(seqA);
+                                       set<string>::iterator bIt = groups[i].find(seqB);
+                                       
+                                       if(groupIDA == -1 && aIt != groups[i].end()){//seqA is not already assigned to a group and is in group[i], so assign seqB to group[i]
+                                               groups[i].insert(seqB);
+                                               groupIDA = i;
+                                               groupID = groupIDA;
+
+                                               //cout << "in aIt: " << groupID << endl;
+       //                                      break;
+                                       }
+                                       else if(groupIDB == -1 && bIt != groups[i].end()){//seqB is not already assigned to a group and is in group[i], so assign seqA to group[i]
+                                               groups[i].insert(seqA);
+                                               groupIDB = i;
+                                               groupID = groupIDB;
+
+                                       //      cout << "in bIt: " << groupID << endl;
+       //                                      break;
+                                       }
+                               
+                                       if(groupIDA != -1 && groupIDB != -1){//both ifs above have been executed, so we need to decide who to assign them to
+                                               if(groupIDA < groupIDB){
+                                               //      cout << "A: " << groupIDA << "\t" << groupIDB << endl;
+                                                       groups[groupIDA].insert(groups[groupIDB].begin(), groups[groupIDB].end()); //merge two groups into groupIDA
+                                                       groups[groupIDB].clear(); 
+                                                       groupID = groupIDA;
+                                               }
+                                               else{
+                                               //      cout << "B: " << groupIDA << "\t" << groupIDB << endl;
+                                                       groups[groupIDB].insert(groups[groupIDA].begin(), groups[groupIDA].end()); //merge two groups into groupIDB
+                                                       groups[groupIDA].clear();  
+                                                       groupID = groupIDB;
+                                               }
+                                               break;
+                                       }
+                               }
+                               
+       //windows is gonna gag on the reuse of outFile, will need to make it local...
+                               
+                               if(groupIDA == -1 && groupIDB == -1){ //we need a new group
+                                       set<string> newGroup;
+                                       newGroup.insert(seqA);
+                                       newGroup.insert(seqB);
+                                       groups.push_back(newGroup);
+                                                                       
+                                       string tempOut = seqA + '\t' + seqB + '\t' + toString(dist) + '\n';
+                                       outputs.push_back(tempOut);
+                                       numGroups++;
+                               }
+                               else{
+                                                                                       
+                                       outputs[groupID] +=  seqA + '\t' + seqB + '\t' + toString(dist)  + '\n';
+                                       
+                                       if(groupIDA != -1 && groupIDB != -1){ //merge distance files of two groups you merged above
+                                               string row, column, distance;
+                                               if(groupIDA<groupIDB){
+                                                       //merge memory
+                                                       outputs[groupID] += outputs[groupIDB];
+                                                       outputs[groupIDB] = "";
+                                               }else{
+                                                       outputs[groupID] += outputs[groupIDA];
+                                                       outputs[groupIDA] = "";
+                                               }                                       
+                                       }
+                               }
+                       }
+                       m->gobble(dFile);
+               }
+               dFile.close();
+               
+               for (int i = 0; i < numGroups; i++) {
+                       if (outputs[i] != "") {
+                               ofstream outFile;
+                               string fileName = distFile + "." + toString(i) + ".temp";
+                               outFile.open(fileName.c_str(), ios::ate);
+                               outFile << outputs[i];
+                               outFile.close();
+                       }
+               }
+
+               splitNames(groups);
+                               
+               return 0;                       
+       }
+       catch(exception& e) {
+               m->errorOut(e, "SplitMatrix", "splitDistanceRAM");
+               exit(1);
+       }
+}
+//********************************************************************************************************************
+//sorts biggest to smallest
+inline bool compareFileSizes(map<string, string> left, map<string, string> right){
+       
+       FILE * pFile;
+       long leftsize = 0;
+               
+       //get num bytes in file
+       string filename = left.begin()->first;
+       pFile = fopen (filename.c_str(),"rb");
+       string error = "Error opening " + filename;
+       if (pFile==NULL) perror (error.c_str());
+       else{
+               fseek (pFile, 0, SEEK_END);
+               leftsize=ftell (pFile);
+               fclose (pFile);
+       }
+
+       FILE * pFile2;
+       long rightsize = 0;
+               
+       //get num bytes in file
+       filename = right.begin()->first;
+       pFile2 = fopen (filename.c_str(),"rb");
+       error = "Error opening " + filename;
+       if (pFile2==NULL) perror (error.c_str());
+       else{
+               fseek (pFile2, 0, SEEK_END);
+               rightsize=ftell (pFile2);
+               fclose (pFile2);
+       }
+
+       return (leftsize > rightsize);  
+} 
+/***********************************************************************/
+//returns map of distance files -> namefile sorted by distance file size
+vector< map< string, string> > SplitMatrix::getDistanceFiles(){
+       try {   
+               
+               sort(dists.begin(), dists.end(), compareFileSizes);
+               
+               return dists;
+       }
+       catch(exception& e) {
+               m->errorOut(e, "SplitMatrix", "getDistanceFiles");
+               exit(1);
+       }
+}
+/***********************************************************************/
+SplitMatrix::~SplitMatrix(){}
+/***********************************************************************/
+