GRASS GIS 8 Programmer's Manual
8.2.2dev(2023)-3d2c704037
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xacos.c
Go to the documentation of this file.
1
2
#include <stdlib.h>
3
#include <math.h>
4
5
#include <
grass/gis.h
>
6
#include <
grass/raster.h
>
7
#include <
grass/calc.h
>
8
9
/**********************************************************************
10
acos(x) [0 and PI]
11
12
if floating point exception occurs during the evaluation of acos(x)
13
the result is NULL
14
15
note: result is in degrees
16
**********************************************************************/
17
18
#define RADIANS_TO_DEGREES (180.0 / M_PI)
19
20
int
f_acos
(
int
argc,
const
int
*argt,
void
**args)
21
{
22
DCELL
*res = args[0];
23
DCELL
*arg1 = args[1];
24
int
i;
25
26
if
(argc < 1)
27
return
E_ARG_LO
;
28
if
(argc > 1)
29
return
E_ARG_HI
;
30
31
if
(argt[0] !=
DCELL_TYPE
)
32
return
E_RES_TYPE
;
33
34
if
(argt[1] !=
DCELL_TYPE
)
35
return
E_ARG_TYPE
;
36
37
for
(i = 0; i <
columns
; i++)
38
if
(
IS_NULL_D
(&arg1[i]))
39
SET_NULL_D
(&res[i]);
40
else
{
41
floating_point_exception
= 0;
42
res[i] =
RADIANS_TO_DEGREES
* acos(arg1[i]);
43
if
(
floating_point_exception
)
44
SET_NULL_D
(&res[i]);
45
}
46
47
return
0;
48
}
DCELL
double DCELL
Definition:
gis.h:614
E_ARG_TYPE
Definition:
calc.h:14
E_ARG_HI
Definition:
calc.h:13
columns
int columns
Definition:
calc.c:12
floating_point_exception
volatile int floating_point_exception
Definition:
calc.c:9
raster.h
gis.h
DCELL_TYPE
#define DCELL_TYPE
Definition:
raster.h:13
f_acos
int f_acos(int argc, const int *argt, void **args)
Definition:
xacos.c:20
RADIANS_TO_DEGREES
#define RADIANS_TO_DEGREES
Definition:
xacos.c:18
E_ARG_LO
Definition:
calc.h:12
IS_NULL_D
#define IS_NULL_D(x)
Definition:
calc.h:30
E_RES_TYPE
Definition:
calc.h:15
SET_NULL_D
#define SET_NULL_D(x)
Definition:
calc.h:34
calc.h
lib
calc
xacos.c
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