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Re: Reversing a multi-dimensional array [message #35591]

Mon, 07 July 2003 09:30

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

Hi Andy,

"Andy Loughe ( remove OMITs )" <Andrew.LougheOMIT@noaaOMIT.govOMIT>
wrote in message news:3F04BF29.7030406@noaaOMIT.govOMIT...
> Hello,
>
> I have a 4-dimensional array, but it could someday grow to become
> 6 or 7 dimensions. What I would like to do is reverse the entire
> array, so that if it is now: a(i,j,k,l) it becomes a(l,k,j,i).
>
> What is the most efficient method for accomplishing this in IDL?

While I wouldn't call this a reversal of the array (rather, a
transposition reversing the dimensions of the array), I think what
you're looking for is:

a = Transpose(a)

The reversal of dimensions is the default behaviour of Transpose,
equivalent to:

a = Transpose(a, [3, 2, 1, 0])

If you needed some other ordering, you would give a different ordering
of values in the array.

Cheers,
--
-Dick

Dick Jackson / dick@d-jackson.com
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392

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[Message index]

		Re: Reversing a multi-dimensional array By: Dick Jackson on Mon, 07 July 2003 09:30
		Re: Reversing a multi-dimensional array By: Craig Markwardt on Thu, 03 July 2003 17:06
		Re: Reversing a multi-dimensional array By: David Fanning on Thu, 03 July 2003 16:59

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