GRASS GIS 8 Programmer's Manual 8.3.2(2024)-exported
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xshiftr.c
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1#include <grass/gis.h>
2#include <grass/raster.h>
3#include <grass/calc.h>
4
5/****************************************************************
6shiftr(a,b) = a >> b
7****************************************************************/
8
9int f_shiftr(int argc, const int *argt, void **args)
10{
11 CELL *res = args[0];
12 CELL *arg1 = args[1];
13 CELL *arg2 = args[2];
14 int i;
15
16 if (argc < 2)
17 return E_ARG_LO;
18 if (argc > 2)
19 return E_ARG_HI;
20
21 if (argt[1] != CELL_TYPE || argt[2] != CELL_TYPE)
22 return E_ARG_TYPE;
23
24 if (argt[0] != CELL_TYPE)
25 return E_RES_TYPE;
26
27 for (i = 0; i < columns; i++) {
28 if (IS_NULL_C(&arg1[i]) || IS_NULL_C(&arg2[i]))
29 SET_NULL_C(&res[i]);
30 else
31 res[i] = arg1[i] >> arg2[i];
32 }
33
34 return 0;
35}
int columns
Definition calc.c:11
int f_shiftr(int argc, const int *argt, void **args)
Definition xshiftr.c:9