GRASS GIS 7 Programmer's Manual  7.5.svn(2017)-r71806
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c_ave.c
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1 #include <grass/gis.h>
2 #include <grass/raster.h>
3 
4 void c_ave(DCELL * result, DCELL * values, int n, const void *closure)
5 {
6  DCELL sum;
7  int count;
8  int i;
9 
10  sum = 0.0;
11  count = 0;
12 
13  for (i = 0; i < n; i++) {
14  if (Rast_is_d_null_value(&values[i]))
15  continue;
16 
17  sum += values[i];
18  count++;
19  }
20 
21  if (count == 0)
22  Rast_set_d_null_value(result, 1);
23  else
24  *result = sum / count;
25 }
26 
27 void w_ave(DCELL * result, DCELL(*values)[2], int n, const void *closure)
28 {
29  DCELL sum;
30  DCELL count;
31  int i;
32 
33  sum = 0.0;
34  count = 0.0;
35 
36  for (i = 0; i < n; i++) {
37  if (Rast_is_d_null_value(&values[i][0]))
38  continue;
39 
40  sum += values[i][0] * values[i][1];
41  count += values[i][1];
42  }
43 
44  if (count == 0)
45  Rast_set_d_null_value(result, 1);
46  else
47  *result = sum / count;
48 }
double DCELL
Definition: gis.h:581
void w_ave(DCELL *result, DCELL(*values)[2], int n, const void *closure)
Definition: c_ave.c:27
int count
void c_ave(DCELL *result, DCELL *values, int n, const void *closure)
Definition: c_ave.c:4
void Rast_set_d_null_value(DCELL *dcellVals, int numVals)
To set a number of DCELL raster values to NULL.
Definition: null_val.c:155
int Rast_is_d_null_value(const DCELL *dcellVal)
To check if a DCELL raster value is set to NULL.
Definition: null_val.c:261