Function sprs::transform_mat_papt

pub fn transform_mat_papt<N, I, Iptr>(
    mat: CsMatViewI<'_, N, I, Iptr>, 
    perm: PermViewI<'_, I>
) -> CsMatI<N, I, Iptr> where
    N: Clone + Debug,
    I: SpIndex,
    Iptr: SpIndex, 

Compute the square matrix resulting from the product P * A * P^T