
This is beautiful! Thank you Pauli. On Sat, Dec 4, 2010 at 7:16 PM, Pauli Virtanen <pav@iki.fi> wrote:
On Sat, 04 Dec 2010 19:00:43 +0000, Eleftherios Garyfallidis wrote: [clip]
I am using ndindex and then a for loop. Is there a better/faster way?
Yes:
import numpy as np from numpy import newaxis
x = np.zeros((200, 200, 200, 3)) x[...,0] = np.arange(200)[:,newaxis,newaxis] x[...,1] = np.arange(200)[newaxis,:,newaxis] x[...,2] = np.arange(200)[newaxis,newaxis,:] x[1,3,2] # -> array([ 1., 3., 2.])
Depending on what you use this array for, it's possible that you can avoid constructing it (and use broadcasting etc. instead).
-- Pauli Virtanen
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