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Re: Swap even/odd elements in array [message #44589 is a reply to message #44507]

Wed, 22 June 2005 06:22

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

In article <1119428174.330105.170110@o13g2000cwo.googlegroups.com>,
photosalex@freenetname.co.uk wrote:

> Hi All,
> sorry if the question is trivial:
> how could I swap even and odd elements of a 1-D 16-bit INT array
> without using loops? That is, if the source array is
>
> [a0,a1,a2,a3,..]
>
> I want it to be
>
> [a1,a0,a3,a2,..]
>
> Thanks!

IDL> x = lindgen(16)
IDL> print, x
0 1 2 3 4 5
6 7
8 9 10 11 12 13
14 15
IDL> x = reform(reverse(reform(x, 2, 8), 1), 16)
IDL> print, x
1 0 3 2 5 4
7 6
9 8 11 10 13 12
15 14

Cheers, Ken Bowman

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[Message index]

		Swap even/odd elements in array By: photosalex on Wed, 22 June 2005 01:16
		Re: Swap even/odd elements in array By: JD Smith on Tue, 28 June 2005 12:00
		Re: Swap even/odd elements in array By: Craig Markwardt on Thu, 23 June 2005 00:52
		Re: Swap even/odd elements in array By: Peter Mason on Wed, 22 June 2005 14:43
		Re: Swap even/odd elements in array By: K. Bowman on Wed, 22 June 2005 06:22
		Re: Swap even/odd elements in array By: David Fanning on Wed, 22 June 2005 07:06
		Re: Swap even/odd elements in array By: Xavier Llobet on Wed, 22 June 2005 01:52

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