Function gsl_sys::gsl_matrix_char_const_submatrix

pub unsafe extern "C" fn gsl_matrix_char_const_submatrix(
    m: *const gsl_matrix_char, 
    i: usize, 
    j: usize, 
    n1: usize, 
    n2: usize
) -> _gsl_matrix_char_const_view