How do I scale a numpy array?

Question

Let's say I have an array like

0,1,0
0,1,0
0,1,0

Is there a way that I can get this array to be double the dimensions so that let's so the new array is like this:

0,0,1,1,0,0
0,0,1,1,0,0
0,0,1,1,0,0
0,0,1,1,0,0
0,0,1,1,0,0
0,0,1,1,0,0

Could you rephrase your question? What is the original dimensions of your array and the final dimension you need? — Aryan Bansal
– Aryan Bansal, Commented Jun 19, 2021 at 22:23
You want every row to be duplicated so [a, b, c] would become [a, a, b, b, c, c], and every column to then be duplicated as well? — user9321739
– user9321739, Commented Jun 19, 2021 at 23:03
@AryanBansal numpy.resize would take array [a, b, c] and produce [a, b, c, a, b, c] — user9321739
– user9321739, Commented Jun 19, 2021 at 23:10
@Jared the question was edited after my comment. Earlier it was a lot more confusing and unclear so I wasn't sure what OP wanted to do. — Aryan Bansal
– Aryan Bansal, Commented Jun 20, 2021 at 6:19

Mark · Accepted Answer · 2021-06-19 23:09:40Z

2

numpy.repeat() should work here. I think you have to call it twice to get it to repeat in both axes.

a = np.array([[0,1,0],
              [0,1,0],
              [0,1,0]
             ])

a.repeat(2, axis=1).repeat(2, axis=0)

This gives you:

array([[0, 0, 1, 1, 0, 0],
       [0, 0, 1, 1, 0, 0],
       [0, 0, 1, 1, 0, 0],
       [0, 0, 1, 1, 0, 0],
       [0, 0, 1, 1, 0, 0],
       [0, 0, 1, 1, 0, 0]])

answered Jun 19, 2021 at 23:09

Mark

92.6k8 gold badges116 silver badges156 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How do I scale a numpy array?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related