/*! \page clusterlib GRASS Cluster analysis statistics Library

by GRASS Development Team (http://grass.osgeo.org)

\section clusterintro Introduction

This library does a k-means style of cluster analysis. It is currently
only used by <tt>i.cluster</tt>.

The library functions are defined in <tt>cluster.h</tt>.

\code
#include <grass/cluster.h>
\endcode

\section ClusterStruct Cluster structure

\code
struct Cluster
{
    int nbands;                 /* number of bands */
    int npoints;                /* number of points */
    DCELL **points;             /* array of points */
    int np;

    double *band_sum;		/* sum over each band */
    double *band_sum2;		/* sum of squares over each band */

    int *class;			/* class of each point */
    int *reclass;		/* for removing empty classes  */
    int *count;			/* number of points in each class */
    int *countdiff;		/* change in count */
    double **sum;		/* sum over band per class */
    double **sumdiff;		/* change in sum */
    double **sum2;		/* sum of squares per band per class */
    double **mean;		/* initial class means */
    struct Signature S;		/* final signature(s) */

    int nclasses;               /* number of classes */
    int merge1, merge2;
    int iteration;              /* number of iterations */
    double percent_stable;      /* percentage stable */
};
\endcode

\section listFn List of functions

 - I_cluster_assign()

 - I_cluster_begin()

 - I_cluster_clear()

 - I_cluster_distinct()

 - I_cluster_exec()

 - I_cluster_exec_allocate()

 - I_cluster_exec_free()

 - I_cluster_means()

 - I_cluster_merge()

 - I_cluster_nclasses()

 - I_cluster_point()

 - I_cluster_begin_point_set()

 - I_cluster_point_part()

 - I_cluster_end_point_set()

 - I_cluster_reassign()

 - I_cluster_reclass()

 - I_cluster_separation()

 - I_cluster_signatures()

 - I_cluster_sum2()

*/