GRASS GIS 8 Programmer's Manual
8.4.1(2025)-45ca3179ab
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xneg.c
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#include <grass/gis.h>
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#include <grass/raster.h>
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#include <grass/calc.h>
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/**********************************************************************
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neg(x) = -x
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**********************************************************************/
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int
f_neg
(
int
argc,
const
int
*argt,
void
**args)
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{
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int
i;
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if
(argc < 1)
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return
E_ARG_LO;
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if
(argc > 1)
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return
E_ARG_HI;
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if
(argt[0] != argt[1])
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return
E_RES_TYPE;
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switch
(argt[1]) {
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case
CELL_TYPE: {
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CELL *res = args[0];
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CELL *arg1 = args[1];
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for
(i = 0; i <
columns
; i++)
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if
(IS_NULL_C(&arg1[i]))
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SET_NULL_C(&res[i]);
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else
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res[i] = -arg1[i];
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return
0;
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}
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case
FCELL_TYPE: {
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FCELL *res = args[0];
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FCELL *arg1 = args[1];
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for
(i = 0; i <
columns
; i++)
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if
(IS_NULL_F(&arg1[i]))
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SET_NULL_F(&res[i]);
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else
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res[i] = -arg1[i];
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return
0;
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}
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case
DCELL_TYPE: {
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DCELL *res = args[0];
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DCELL *arg1 = args[1];
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for
(i = 0; i <
columns
; i++)
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if
(IS_NULL_D(&arg1[i]))
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SET_NULL_D(&res[i]);
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else
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res[i] = -arg1[i];
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return
0;
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}
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default
:
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return
E_INV_TYPE;
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}
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}
columns
int columns
Definition
calc.c:11
f_neg
int f_neg(int argc, const int *argt, void **args)
Definition
xneg.c:9
calc
xneg.c
Generated on Sat Jun 21 2025 21:07:27 for GRASS GIS 8 Programmer's Manual by
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