GRASS 8 Programmer's Manual
8.6.0dev(2026)-5a31d549cc
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c_sum.c
Go to the documentation of this file.
1
#include <
grass/gis.h
>
2
#include <
grass/raster.h
>
3
4
void
c_sum
(
DCELL
*result,
DCELL
*values,
int
n,
const
void
*closure
G_UNUSED
)
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{
6
DCELL
sum;
7
int
count
;
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int
i;
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sum = 0.0;
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count
= 0;
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for
(i = 0; i < n; i++) {
14
if
(
Rast_is_d_null_value
(&values[i]))
15
continue
;
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sum += values[i];
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count
++;
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}
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if
(
count
== 0)
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Rast_set_d_null_value
(result, 1);
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else
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*result = sum;
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}
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void
w_sum
(
DCELL
*result,
DCELL
(*values)[2],
int
n,
28
const
void
*closure
G_UNUSED
)
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{
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DCELL
sum;
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DCELL
count
;
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int
i;
33
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sum = 0.0;
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count
= 0.0;
36
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for
(i = 0; i < n; i++) {
38
if
(
Rast_is_d_null_value
(&values[i][0]))
39
continue
;
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sum += values[i][0] * values[i][1];
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count
+= values[i][1];
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}
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if
(
count
== 0)
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Rast_set_d_null_value
(result, 1);
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else
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*result = sum;
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}
Rast_set_d_null_value
void Rast_set_d_null_value(DCELL *, int)
To set a number of DCELL raster values to NULL.
Definition
null_val.c:153
Rast_is_d_null_value
#define Rast_is_d_null_value(dcellVal)
Definition
defs/raster.h:417
c_sum
stat_func c_sum
w_sum
stat_func_w w_sum
gis.h
G_UNUSED
#define G_UNUSED
A macro for an attribute, if attached to a variable, indicating that the variable is not used.
Definition
gis.h:46
DCELL
double DCELL
Definition
gis.h:635
count
int count
raster.h
lib
stats
c_sum.c
Generated on Fri Apr 17 2026 07:00:46 for GRASS 8 Programmer's Manual by
1.9.8