How to convert list of numpy arrays to numpy array

Question

I want to make a sliding window for LSTM. For this I have:

x_train=[[]]
y_train = []

for i in range(10, len(train_data)):
  x_train.append(train_data[i-10:i])
  y_train.append(train_data[i,0])

The shape of train_data is (2730, 2), so I suppose x_train will be (2721, 10, 2).
After the loop x_train and y_train are lists of numpy arrays.
In tutorials it's enough to apply np.asarray or np.array to change it to numpy array. In my case it changes shape to (2721, ) and that's not really what I expected.
Probably, it's better to use numpy arrays and not lists.
But I wonder why in tutorials the way I do works and it doesn't for me. Maybe there is a small error or something in the code?

P.S. Sorry, I found an error by myself. It was x_train=[[]], but it should be x_train=[].

Does this answer your question? How to convert list of numpy arrays into single numpy array? — Chris
– Chris, Commented Mar 11, 2021 at 14:55
@matanh yeah it's auto filled when I voted to close the question as duplicated, if you have the rep to vote to close that's probably better than posting the link directly. — Chris
– Chris, Commented Mar 11, 2021 at 14:58

blue sky · Accepted Answer · 2021-03-11 15:01:54Z

0

Thank you for your comments. Actually in that situation it was a good solution to concatenate numpy arrays. Here I made an error creating a wrong type of list, so the fix is rather obvious, just to replace x_train=[[]] by x_train=[].

answered Mar 11, 2021 at 15:01

blue sky

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