GRASS GIS 8 Programmer's Manual  8.4.0dev(2024)-535c39c9fc
GRASS Cluster analysis statistics Library

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

Introduction

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

The library functions are defined in cluster.h.

Cluster structure

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 */
};
double DCELL
Definition: gis.h:626
Definition: cluster.h:7
int iteration
Definition: cluster.h:28
int * count
Definition: cluster.h:18
double percent_stable
Definition: cluster.h:29
double ** sum2
Definition: cluster.h:22
int npoints
Definition: cluster.h:9
int * countdiff
Definition: cluster.h:19
struct Signature S
Definition: cluster.h:24
double * band_sum2
Definition: cluster.h:14
int nclasses
Definition: cluster.h:26
double ** mean
Definition: cluster.h:23
DCELL ** points
Definition: cluster.h:10
int merge2
Definition: cluster.h:27
int * reclass
Definition: cluster.h:17
int np
Definition: cluster.h:11
double * band_sum
Definition: cluster.h:13
int merge1
Definition: cluster.h:27
double ** sum
Definition: cluster.h:20
int nbands
Definition: cluster.h:8
double ** sumdiff
Definition: cluster.h:21

List of functions