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Re: Swap even/odd elements in array [message #44595 is a reply to message #44589]

Wed, 22 June 2005 07:06

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Ken Bowman writes:

>> how could I swap even and odd elements of a 1-D 16-bit INT array
>> without using loops?
>
> 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

Those of you who have been invited to answer the Test Question
(http://www.dfanning.com/misc_tips/iepa.html) at this year's
IEPA conference might want to take careful note of this answer.
I'd say the chances are pretty good you might see it again. ;-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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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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