Reordering numpy array

Question

I have the following Numpy array:

arr = np.array([0.3, 3.5, 12.0, 2.9, 11.0, 23.0])

I want to reorder the array so it starts at the 4th position, followed by the items after the start position in order, followed by the items before the start position. I.e.

[2.9, 11.0, 23.0, 0.3, 3.5, 12.0]

How can I do this without a for loop?

saladi · Accepted Answer · 2016-03-07 01:47:38Z

4

Try

np.roll(arr, -3)

Negative since you want to "move" elements to the left

answered Mar 7, 2016 at 1:47

saladi

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roadrunner66 · Accepted Answer · 2016-03-07 01:44:35Z

3

The command you are looking for is numpy.roll. It's the equivalent of Mathematica's Rotate command.

answered Mar 7, 2016 at 1:44

roadrunner66

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