code: def cublasSgemv(handle, trans, m, n, alpha, A, lda, x, incx, beta, y, incy):
      
  
      status = _libcublas.cublasSgemv_v2(handle,
                                         _CUBLAS_OP[trans], m, n,
                                         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 matrix.