- void push_back(int, int, string); //abundance, OTU, groupname
+ int numNZ();
+ void sortD(); //Sorts the data in descending order.
+ void push_front(int, int, string); //abundance, otu, groupname
+ void insert(int, int, string); //abundance, otu, groupname
+ void push_back(int, string); //abundance, groupname