GRASS GIS 7 Programmer's Manual
7.8.4(2020)-exported
xor2.c
Go to the documentation of this file.
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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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or2(a,b,c,...) = a || b || c || ...
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Differs from or() in that the boolean axioms:
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true || x == true
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x || true == true
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hold even when x is null.
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****************************************************************/
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int
f_or2
(
int
argc,
const
int
*argt,
void
**args)
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{
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CELL *res = args[0];
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int
i, j;
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if
(argc < 1)
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return
E_ARG_LO;
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if
(argt[0] != CELL_TYPE)
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return
E_RES_TYPE;
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for
(i = 1; i <= argc; i++)
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if
(argt[i] != argt[0])
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return
E_ARG_TYPE;
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for
(i = 0; i <
columns
; i++) {
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res[i] = 0;
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for
(j = 1; j <= argc; j++) {
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CELL *arg = args[j];
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if
(!IS_NULL_C(&arg[i]) && arg[i]) {
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res[i] = 1;
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break
;
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}
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if
(IS_NULL_C(&arg[i]))
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SET_NULL_C(&res[i]);
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}
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}
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return
0;
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}
columns
int columns
Definition:
calc.c:12
f_or2
int f_or2(int argc, const int *argt, void **args)
Definition:
xor2.c:17
calc
xor2.c
Generated on Mon Oct 5 2020 08:56:03 for GRASS GIS 7 Programmer's Manual by
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