c_stddev.c

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#include <math.h>
 
#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/stats.h>
 
void c_stddev(DCELL *result, DCELL *values, int n, const void *closure)
{
    DCELL var;
 
    c_var(&var, values, n, closure);
 
    if (Rast_is_d_null_value(&var))
        Rast_set_d_null_value(result, 1);
    else
        *result = sqrt(var);
}
 
void w_stddev(DCELL *result, DCELL (*values)[2], int n, const void *closure)
{
    DCELL var;
 
    w_var(&var, values, n, closure);
 
    if (Rast_is_d_null_value(&var))
        Rast_set_d_null_value(result, 1);
    else
        *result = sqrt(var);
}