np.append will stack vertically - but you first have to take time to read its docs! np.append is just a crudely written front end ... ... <看更多>

numpy.append 會添加values值到arr陣列尾部，會回傳一個新配置的陣列，輸入陣列的維度必須相符合。 以下為範例， a 為2x3 的矩陣(numpy.ndarray)， ... <看更多>

Reproducing code example: np.append is extremely slow, why is that the case? The docs don't have anything on the performance part. ... <看更多>