GRASS Programmer's Manual  6.5.svn(2014)-r66266
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c_maxx.c
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1 #include <grass/gis.h>
2 
3 void c_maxx(DCELL * result, DCELL * values, int n, const void *closure)
4 {
5  DCELL max, maxx;
6  int i;
7 
8  G_set_d_null_value(&max, 1);
9  G_set_d_null_value(&maxx, 1);
10 
11  for (i = 0; i < n; i++) {
12  if (G_is_d_null_value(&values[i]))
13  continue;
14 
15  if (G_is_d_null_value(&max) || max < values[i]) {
16  max = values[i];
17  maxx = i;
18  }
19  }
20 
21  if (G_is_d_null_value(&maxx))
22  G_set_d_null_value(result, 1);
23  else
24  *result = maxx;
25 }
void G_set_d_null_value(DCELL *dcellVals, int numVals)
Definition: null_val.c:176
#define max(x, y)
Definition: draw2.c:69
int G_is_d_null_value(const DCELL *dcellVal)
Returns 1 if dcell is NULL, 0 otherwise. This will test if the value dcell is a NaN. Same test as in G_is_f_null_value().
Definition: null_val.c:306
void c_maxx(DCELL *result, DCELL *values, int n, const void *closure)
Definition: c_maxx.c:3
int n
Definition: dataquad.c:291