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Re: a=a(*,*,[4,1,2,3,0]) efficiency [message #12294 is a reply to message #12291]

Tue, 14 July 1998 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Ray wrote:
>
> I am wondering about the efficiency of the following
>
> <snip>
> ; reorder data
> a=a(*,*,[4,1,2,3,0])
>
> Does IDL make a temporary copy of a when size of the left
> hand side (a) is the same as the right hand side a(*,*,[4,1,2,3,0]) ?
> If so, is there a better way to reorder my data? In my application
> the last dimension of a is typically much greater than 5 (e.g. 300).
>

Ray -

I would suggest using the temporary() function to reduce the
memory overhead:

a = temporary(a(*,*,[4,1,2,3,0]))

Dave

--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

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[Message index]

		Re: a=a(,,[4,1,2,3,0]) efficiency By: menakkis on Wed, 15 July 1998 00:00
		Re: a=a(,,[4,1,2,3,0]) efficiency By: David Kastrup on Wed, 15 July 1998 00:00
		Re: a=a(,,[4,1,2,3,0]) efficiency By: David Foster on Tue, 14 July 1998 00:00

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