Function rgsl::sort::select::sort_smallest_index

pub fn sort_smallest_index(
    p: &mut [usize], 
    k: usize, 
    src: &[f64], 
    stride: usize
) -> Value

This function stores the indices of the k smallest elements of the array src, of size n and stride stride, in the array p. The indices are chosen so that the corresponding data is in ascending numerical order. k must be less than or equal to n. The data src is not modified by this operation.