GRASS GIS 7 Programmer's Manual
7.8.2(2019)-exported
xasin.c
Go to the documentation of this file.
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#include <stdlib.h>
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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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asin(x) range [-90,90]
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if floating point exception occurs during the evaluation of asin(x)
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the result is NULL
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note: result is in degrees
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**********************************************************************/
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#define RADIANS_TO_DEGREES (180.0 / M_PI)
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int
f_asin
(
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] =
RADIANS_TO_DEGREES
* asin(arg1[i]);
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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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}
RADIANS_TO_DEGREES
#define RADIANS_TO_DEGREES
Definition:
xasin.c:18
columns
int columns
Definition:
calc.c:12
f_asin
int f_asin(int argc, const int *argt, void **args)
Definition:
xasin.c:20
floating_point_exception
volatile int floating_point_exception
Definition:
calc.c:9
calc
xasin.c
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