c_minx.c

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#include <grass/gis.h>
#include <grass/raster.h>

void c_minx(DCELL * result, DCELL * values, int n, const void *closure)
{
    DCELL min, minx;
    int i;

    Rast_set_d_null_value(&min, 1);
    Rast_set_d_null_value(&minx, 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];
            minx = i;
        }
    }

    if (Rast_is_d_null_value(&minx))
        Rast_set_d_null_value(result, 1);
    else
        *result = minx;
}