def compute_derivs_matrices(vecs, adv_vecs, dt):
    """Computes 1st-order time derivatives of vectors from data in matrices. 
    
    Args:
        ``vecs``: Matrix with vectors as columns.
        
        ``adv_vecs``: Matrix with time-advanced vectors as columns.
        
        ``dt``: Time step between ``vecs`` and ``adv_vecs``.
                
    Returns:
        ``deriv_vecs``: Matrix of with time-derivs of vectors as cols.
    """
    return (adv_vecs - vecs)/(1.*dt)