Function sprs::hstack

pub fn hstack<'a, N, MatArray, I>(mats: &MatArray) -> CsMatI<N, I> where
    N: 'a + Clone + Default,
    I: 'a + SpIndex,
    MatArray: AsRef<[CsMatViewI<'a, N, I>]>, 

Construct a sparse matrix by horizontally stacking other matrices