code: def cublasSgbmv(handle, trans, m, n, kl, ku, alpha, A, lda,
                  x, incx, beta, y, incy):
      
  
      status = _libcublas.cublasSgbmv_v2(handle,
                                         trans, m, n, kl, ku,
                                         ctypes.byref(ctypes.c_float(alpha)),
                                         int(A), lda,
                                         int(x), incx,
                                         ctypes.byref(ctypes.c_float(beta)),
                                         int(y), incy)
      cublasCheckStatus(status)
docs: Matrix-vector product for real general banded matrix.