Python：如何在具有 N 列的矩阵中转换数组，这些数组是重复 N 次的相同数组？

Question

I have an array and I have to create a matrix with N columns (N is a parameter that can be changed). So we have to copy this array N times.

Answer 1

If I understand correctly your input would be for example:

a = [12, 8, 9]
n = 2

And the output would be:

b = [[12, 12],
     [ 8,  8],
     [ 9,  9]]

Here is how you could do that:

b = [[i]*n for i in a]