GRASS GIS 8 Programmer's Manual
8.5.0dev(2024)-8dced26735
xabs.c
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#include <math.h>
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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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abs(x)
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absolute value. if x is negative returns -x
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**********************************************************************/
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int
f_abs
(
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] < 0 ? -arg1[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] = (
FCELL
)fabs(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] = fabs(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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}
calc.h
E_INV_TYPE
@ E_INV_TYPE
Definition:
calc.h:15
E_RES_TYPE
@ E_RES_TYPE
Definition:
calc.h:14
E_ARG_HI
@ E_ARG_HI
Definition:
calc.h:12
E_ARG_LO
@ E_ARG_LO
Definition:
calc.h:11
IS_NULL_C
#define IS_NULL_C(x)
Definition:
calc.h:26
SET_NULL_D
#define SET_NULL_D(x)
Definition:
calc.h:32
columns
int columns
Definition:
calc.c:11
SET_NULL_C
#define SET_NULL_C(x)
Definition:
calc.h:30
IS_NULL_F
#define IS_NULL_F(x)
Definition:
calc.h:27
IS_NULL_D
#define IS_NULL_D(x)
Definition:
calc.h:28
SET_NULL_F
#define SET_NULL_F(x)
Definition:
calc.h:31
gis.h
FCELL
float FCELL
Definition:
gis.h:630
DCELL
double DCELL
Definition:
gis.h:629
CELL
int CELL
Definition:
gis.h:628
raster.h
FCELL_TYPE
#define FCELL_TYPE
Definition:
raster.h:12
DCELL_TYPE
#define DCELL_TYPE
Definition:
raster.h:13
CELL_TYPE
#define CELL_TYPE
Definition:
raster.h:11
f_abs
int f_abs(int argc, const int *argt, void **args)
Definition:
xabs.c:13
lib
calc
xabs.c
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