Number of classes

A practical tool for finding quickly the classes of a dataset based on the labels array.

This program was developed to facilitate the analysis of datasets and the development of algorithms in the field of pattern classification. It is significantly faster than the relevant built-in function of Matlab (unique.m) plus it provides some basic details of the classes, such as the indexes of their members and their sizes.

Usage:
[q Q C N] = nc( O )
where O is the label array (vector)
q is the number of classes (integer)
Q is the class labels (vector)
C is the class members' indexes (cell)
N is the number of points in each class (int.)

Any feedback on this file, esp. regarding how it can be improved, would be greatly appreciated.