Function gsl_sys::gsl_blas_dgemm

pub unsafe extern "C" fn gsl_blas_dgemm(
    TransA: CBLAS_TRANSPOSE_t, 
    TransB: CBLAS_TRANSPOSE_t, 
    alpha: f64, 
    A: *const gsl_matrix, 
    B: *const gsl_matrix, 
    beta: f64, 
    C: *mut gsl_matrix
) -> c_int