Function argmin::prelude::modcholesky::utils::swap_columns

pub fn swap_columns<T>(
    mat: &mut ArrayBase<OwnedRepr<T>, Dim<[usize; 2]>>, 
    idx1: usize, 
    idx2: usize
) where
    OwnedRepr<T>: Data, 

Swaps columns idx1 and idx2 of matrix mat