GRASS GIS 7 Programmer's Manual  7.8.4(2020)-exported
c_range.c
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1 #include <grass/gis.h>
2 #include <grass/raster.h>
3 
4 void c_range(DCELL * result, DCELL * values, int n, const void *closure)
5 {
6  DCELL min, max;
7  int i;
8 
9  Rast_set_d_null_value(&min, 1);
10  Rast_set_d_null_value(&max, 1);
11 
12  for (i = 0; i < n; i++) {
13  if (Rast_is_d_null_value(&values[i]))
14  continue;
15 
16  if (Rast_is_d_null_value(&min) || min > values[i])
17  min = values[i];
18 
19  if (Rast_is_d_null_value(&max) || max < values[i])
20  max = values[i];
21  }
22 
23  if (Rast_is_d_null_value(&min) || Rast_is_d_null_value(&max))
24  Rast_set_d_null_value(result, 1);
25  else
26  *result = max - min;
27 }
min
#define min(a, b)
Definition: pngdriver/draw_bitmap.c:19
max
#define max(a, b)
Definition: pngdriver/draw_bitmap.c:22
c_range
void c_range(DCELL *result, DCELL *values, int n, const void *closure)
Definition: c_range.c:4