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Re: Matrix expansion performance [message #43248]

Wed, 30 March 2005 00:22

Timm Weitkamp
Messages: 66
Registered: August 2002

Member

On 29.03.05 at 10:55 +0100, Ricardo Bugalho wrote:

> I think I didn't make clear the ranges of m,n and p.
> In the problem I have at hand, m is always 8, n is usually 5 (min 1, max 16)
> and p is in the range of 10,000 to 100,000.
> Looping over p is a BadThing(tm) due to IDL's high interpretation overhead.

The method that Chris Lee suggested does not use loops. But I think there
is no need for any call to REFORM. And the dimension arguments to REBIN
must be scalars in IDL 5.4. A simple

b = rebin(a, m, n, p, /sample)

should therefore work (and, hopefully, be fast enough for your purposes).

Timm

--
Timm Weitkamp <http://people.web.psi.ch/weitkamp>

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[Message index]

		Re: Matrix expansion performance By: Timm Weitkamp on Wed, 30 March 2005 00:22
		Re: Matrix expansion performance By: Ricardo Bugalho on Tue, 29 March 2005 01:55
		Re: Matrix expansion performance By: Kenneth P. Bowman on Mon, 28 March 2005 05:50
		Re: Matrix expansion performance By: Chris Lee on Mon, 28 March 2005 05:43
		Re: Matrix expansion performance By: Chris Lee on Wed, 30 March 2005 07:21
		Re: Matrix expansion performance By: Ricardo Bugalho on Wed, 30 March 2005 04:18

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