error while copy list to matrix python3

Asked Jun 02 '18 at 17:29

Active Jun 02 '18 at 17:31

Viewed 24 times

i have a list with 12 elements like

list_ = [1, 2 ,3, 4, 5, 6 ,7, 8, 9, 10, 11, 12]

i'd like to copy its values to a 3 x 4 matrix, i did the follow:

matrix = [[0] * 4 ] * 3

list_index = 0
for i in range(3):
    for j in range(4):
        matrix[i][j] = list_[list_index]
        list_index += 1

But i had a bad result, i repeat only the last ligne, when i print:

print(matrix)

the result is:

[[9, 10, 11, 12], [9, 10, 11, 12], [9, 10, 11, 12]]

edited Jun 02 '18 at 17:31

roganjosh

asked Jun 02 '18 at 17:29

Slimane MEHARZI

1

You should add the [tag:python] tag for better coverage (more people can see your question) – cs95 Jun 02 '18 at 17:30
Try: `[data[i:i+4] for i in range(0, 12, 4)]` – Stephen Rauch Jun 02 '18 at 17:37
id resolve it with: for i in range(3): matrix.append([]) for j in range(4): matrix[i].append(list_[list_index]) list_index += 1 – Slimane MEHARZI Jun 02 '18 at 18:29

0 Answers0