Function sprs::assign_to_dense

pub fn assign_to_dense<N, I>(
    array: ArrayViewMut<N, Ix2>, 
    spmat: CsMatViewI<N, I>
) where
    N: Clone,
    I: SpIndex, 

Assign a sparse matrix into a dense matrix

The dense matrix will not be zeroed prior to assignment, so existing values not corresponding to non-zeroes will be preserved.