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#include <grass/gis.h>
void c_sum(DCELL * result, DCELL * values, int n, const void *closure)
{
DCELL sum;
int count;
int i;
sum = 0.0;
count = 0;
for (i = 0; i < n; i++) {
if (G_is_d_null_value(&values[i]))
continue;
sum += values[i];
count++;
}
if (count == 0)
G_set_d_null_value(result, 1);
else
*result = sum;
}
void w_sum(DCELL * result, DCELL(*values)[2], int n, const void *closure)
{
DCELL sum;
DCELL count;
int i;
sum = 0.0;
count = 0.0;
for (i = 0; i < n; i++) {
if (G_is_d_null_value(&values[i][0]))
continue;
sum += values[i][0] * values[i][1];
count += values[i][1];
}
if (count == 0)
G_set_d_null_value(result, 1);
else
*result = sum;
}
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