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#include <grass/gis.h>
#include <grass/raster.h>
void c_range(DCELL *result, DCELL *values, int n, const void *closure UNUSED)
{
DCELL min, max;
int i;
Rast_set_d_null_value(&min, 1);
Rast_set_d_null_value(&max, 1);
for (i = 0; i < n; i++) {
if (Rast_is_d_null_value(&values[i]))
continue;
if (Rast_is_d_null_value(&min) || min > values[i])
min = values[i];
if (Rast_is_d_null_value(&max) || max < values[i])
max = values[i];
}
if (Rast_is_d_null_value(&min) || Rast_is_d_null_value(&max))
Rast_set_d_null_value(result, 1);
else
*result = max - min;
}
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