GRASS GIS 8 Programmer's Manual
8.5.0dev(2024)-ab90c5e5a9
xsin.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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sin(x)
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if floating point exception occurs during the evaluation of sin(x)
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the result is NULL
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note: x is in degrees.
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**********************************************************************/
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#define DEGREES_TO_RADIANS (M_PI / 180.0)
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int
f_sin
(
int
argc,
const
int
*argt,
void
**args)
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{
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DCELL
*res = args[0];
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DCELL
*arg1 = args[1];
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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] !=
DCELL_TYPE
)
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return
E_RES_TYPE
;
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if
(argt[1] !=
DCELL_TYPE
)
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return
E_ARG_TYPE
;
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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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floating_point_exception
= 0;
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res[i] = sin(arg1[i] *
DEGREES_TO_RADIANS
);
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if
(
floating_point_exception
)
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SET_NULL_D
(&res[i]);
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}
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return
0;
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}
calc.h
E_RES_TYPE
@ E_RES_TYPE
Definition:
calc.h:14
E_ARG_TYPE
@ E_ARG_TYPE
Definition:
calc.h:13
E_ARG_HI
@ E_ARG_HI
Definition:
calc.h:12
E_ARG_LO
@ E_ARG_LO
Definition:
calc.h:11
floating_point_exception
volatile int floating_point_exception
Definition:
calc.c:8
SET_NULL_D
#define SET_NULL_D(x)
Definition:
calc.h:32
columns
int columns
Definition:
calc.c:11
IS_NULL_D
#define IS_NULL_D(x)
Definition:
calc.h:28
gis.h
DCELL
double DCELL
Definition:
gis.h:629
raster.h
DCELL_TYPE
#define DCELL_TYPE
Definition:
raster.h:13
DEGREES_TO_RADIANS
#define DEGREES_TO_RADIANS
Definition:
xsin.c:16
f_sin
int f_sin(int argc, const int *argt, void **args)
Definition:
xsin.c:18
lib
calc
xsin.c
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