GRASS GIS 8 Programmer's Manual 8.4.1(2025)-45ca3179ab
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xsin.c
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1#include <math.h>
2
3#include <grass/gis.h>
4#include <grass/raster.h>
5#include <grass/calc.h>
6
7/**********************************************************************
8sin(x)
9
10 if floating point exception occurs during the evaluation of sin(x)
11 the result is NULL
12
13 note: x is in degrees.
14**********************************************************************/
15
16#define DEGREES_TO_RADIANS (M_PI / 180.0)
17
18int f_sin(int argc, const int *argt, void **args)
19{
20 DCELL *res = args[0];
21 DCELL *arg1 = args[1];
22 int i;
23
24 if (argc < 1)
25 return E_ARG_LO;
26 if (argc > 1)
27 return E_ARG_HI;
28
29 if (argt[0] != DCELL_TYPE)
30 return E_RES_TYPE;
31
32 if (argt[1] != DCELL_TYPE)
33 return E_ARG_TYPE;
34
35 for (i = 0; i < columns; i++)
36 if (IS_NULL_D(&arg1[i]))
37 SET_NULL_D(&res[i]);
38 else {
40 res[i] = sin(arg1[i] * DEGREES_TO_RADIANS);
42 SET_NULL_D(&res[i]);
43 }
44
45 return 0;
46}
volatile int floating_point_exception
Definition calc.c:8
int columns
Definition calc.c:11
#define DEGREES_TO_RADIANS
Definition xcos.c:16
int f_sin(int argc, const int *argt, void **args)
Definition xsin.c:18