GRASS GIS 7 Programmer's Manual
7.9.dev(2021)-e5379bbd7
c_sum2.c
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/*!
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\file cluster/c_sum2.c
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\brief Cluster library - Sum of squares
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(C) 2001-2009 by the GRASS Development Team
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This program is free software under the GNU General Public License
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(>=v2). Read the file COPYING that comes with GRASS for details.
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\author Original author CERL
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*/
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#include <
grass/cluster.h
>
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/*!
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\brief Compute sum of squares for each class
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\param C pointer to Cluster structure
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\return 0
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*/
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int
I_cluster_sum2
(
struct
Cluster
*C)
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{
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int
p, band,
class
;
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double
q;
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G_debug
(3,
"I_cluster_sum2(npoints=%d,nclasses=%d,nbands=%d)"
,
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C->
npoints
, C->
nclasses
, C->
nbands
);
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for
(
class
= 0;
class
< C->nclasses;
class
++)
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for
(band = 0; band < C->
nbands
; band++)
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C->
sum2
[band][
class
] = 0;
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for (p = 0; p < C->
npoints
; p++) {
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class
= C->class[p];
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if
(
class
< 0)
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continue
;
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for
(band = 0; band < C->
nbands
; band++) {
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q = C->
points
[band][p];
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C->
sum2
[band][
class
] += q * q;
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}
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}
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return
0;
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}
Cluster::nbands
int nbands
Definition:
cluster.h:9
Cluster::nclasses
int nclasses
Definition:
cluster.h:27
Cluster
Definition:
cluster.h:7
Cluster::npoints
int npoints
Definition:
cluster.h:10
Cluster::sum2
double ** sum2
Definition:
cluster.h:23
Cluster::points
DCELL ** points
Definition:
cluster.h:11
I_cluster_sum2
int I_cluster_sum2(struct Cluster *C)
Compute sum of squares for each class.
Definition:
c_sum2.c:23
cluster.h
G_debug
int G_debug(int, const char *,...) __attribute__((format(printf
lib
cluster
c_sum2.c
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