Method swap

src/complex/matrix.rs:2261–2266

(&mut self, idx1: usize, idx2: usize, shape: Shape)

    }

    unsafe fn swap(&mut self, idx1: usize, idx2: usize, shape: Shape) {
        match shape {
            Shape::Col => swap_vec_ptr(&mut self.col_mut(idx1), &mut self.col_mut(idx2)),
            Shape::Row => swap_vec_ptr(&mut self.row_mut(idx1), &mut self.row_mut(idx2)),
        }
    }

    unsafe fn swap_with_perm(&mut self, p: &[(usize, usize)], shape: Shape) {
        for (i, j) in p.iter() {