GRASS GIS 7 Programmer's Manual
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GRASS GIS 7 Programmer's Manual
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Pages
xisnull.c
Go to the documentation of this file.
1
2
#include <
grass/gis.h
>
3
#include <
grass/raster.h
>
4
#include <
grass/calc.h
>
5
6
/**********************************************************************
7
isnull(x)
8
return 1 if x is null, 0 otherwise
9
**********************************************************************/
10
11
int
f_isnull
(
int
argc,
const
int
*argt,
void
**args)
12
{
13
int
*res = args[0];
14
int
i;
15
16
if
(argc < 1)
17
return
E_ARG_LO
;
18
if
(argc > 1)
19
return
E_ARG_HI
;
20
21
if
(argt[0] !=
CELL_TYPE
)
22
return
E_RES_TYPE
;
23
24
switch
(argt[1]) {
25
case
CELL_TYPE
:
26
{
27
CELL
*arg1 = args[1];
28
29
for
(i = 0; i <
columns
; i++)
30
res[i] =
IS_NULL_C
(&arg1[i]) ? 1 : 0;
31
return
0;
32
}
33
case
FCELL_TYPE
:
34
{
35
FCELL
*arg1 = args[1];
36
37
for
(i = 0; i <
columns
; i++)
38
res[i] =
IS_NULL_F
(&arg1[i]) ? 1 : 0;
39
return
0;
40
}
41
case
DCELL_TYPE
:
42
{
43
DCELL
*arg1 = args[1];
44
45
for
(i = 0; i <
columns
; i++)
46
res[i] =
IS_NULL_D
(&arg1[i]) ? 1 : 0;
47
return
0;
48
}
49
default
:
50
return
E_INV_TYPE
;
51
}
52
}
53
54
int
c_isnull
(
int
argc,
int
*argt)
55
{
56
if
(argc < 1)
57
return
E_ARG_LO
;
58
if
(argc > 1)
59
return
E_ARG_HI
;
60
61
argt[0] =
CELL_TYPE
;
62
63
return
0;
64
}
CELL_TYPE
#define CELL_TYPE
Definition:
raster.h:11
DCELL
double DCELL
Definition:
gis.h:603
IS_NULL_F
#define IS_NULL_F(x)
Definition:
calc.h:29
IS_NULL_C
#define IS_NULL_C(x)
Definition:
calc.h:28
E_ARG_HI
Definition:
calc.h:13
columns
int columns
Definition:
calc.c:12
raster.h
gis.h
c_isnull
int c_isnull(int argc, int *argt)
Definition:
xisnull.c:54
DCELL_TYPE
#define DCELL_TYPE
Definition:
raster.h:13
E_ARG_LO
Definition:
calc.h:12
FCELL
float FCELL
Definition:
gis.h:604
IS_NULL_D
#define IS_NULL_D(x)
Definition:
calc.h:30
CELL
int CELL
Definition:
gis.h:602
E_INV_TYPE
Definition:
calc.h:16
FCELL_TYPE
#define FCELL_TYPE
Definition:
raster.h:12
E_RES_TYPE
Definition:
calc.h:15
calc.h
f_isnull
int f_isnull(int argc, const int *argt, void **args)
Definition:
xisnull.c:11
lib
calc
xisnull.c
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