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Re: How to speed up large FOR loops? [message #79808 is a reply to message #79807]

Tue, 10 April 2012 10:23

Saurav Dhital
Messages: 4
Registered: April 2012

Junior Member

David, I am NOT using the REFORM routine, which I now realize could be
my problem. Here is what I do:

;; combine two 2-d arrays ([N1,N2]) such that the output is
[2,N1,N2]
FUNCTION
form_3Darray,a1,a2
return, transpose([[[transpose(a1)]],
[[transpose(a2)]]])
END

I call this as:
>> x = [[x1],[x2],[x3]] & y = [[y1],[y2],[y3]]
> z = form_3Darray([[x]],[[y]])

I have to do this so I can store z in a single field in the FITS
structure.

Thanks,
~S

On Apr 10, 1:13 pm, David Fanning <n...@idlcoyote.com> wrote:
> Saurav Dhital writes:
>> Yes. More specifically, I reform arrays and assign them to the new
>> FITS structure. This happens a lot.
>
> Are you setting the OVERWRITE keyword on your REFORM
> command? You should be!
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.idlcoyote.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: How to speed up large FOR loops? By: Saurav Dhital on Tue, 10 April 2012 12:39
		Re: How to speed up large FOR loops? By: Craig Markwardt on Tue, 10 April 2012 11:21
		Re: How to speed up large FOR loops? By: Saurav Dhital on Tue, 10 April 2012 10:23
		Re: How to speed up large FOR loops? By: David Fanning on Tue, 10 April 2012 10:13
		Re: How to speed up large FOR loops? By: Fabzi on Tue, 10 April 2012 09:53
		Re: How to speed up large FOR loops? By: Saurav Dhital on Tue, 10 April 2012 09:26
		Re: How to speed up large FOR loops? By: Fabzi on Tue, 10 April 2012 09:17
		Re: How to speed up large FOR loops? By: Matt Francis on Thu, 12 April 2012 19:41
		Re: How to speed up large FOR loops? By: Saurav on Fri, 20 April 2012 09:48

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