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vectorising versus loops [message #38146]

Sun, 22 February 2004 10:16

nasalmon
Messages: 33
Registered: August 2003

Member

Does anyone know what the speed increase factor is in IDL programmes
when going from "do loops" to full vectorisation of arrays? I know all
programmes are different and not every process lends itself to
vectorisation. However, there must be some rule of thumb, ie speed
going as a linear function of the number of array elements times some
factor.

Also, are there any tricks to play if you want to vectorise loops that
have IF statement decision in them, or any general rules for neat
vectorisation of looped programmes?

Many thanks,
Neil

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[Message index]

		vectorising versus loops By: nasalmon on Sun, 22 February 2004 10:16
		Re: vectorising versus loops By: Norbert Hahn on Tue, 24 February 2004 02:13
		Re: vectorising versus loops By: Craig Markwardt on Mon, 23 February 2004 16:04
		Re: vectorising versus loops By: Craig Markwardt on Sun, 07 March 2004 09:24
		Re: vectorising versus loops By: nasalmon on Fri, 26 March 2004 11:34
		Re: vectorising versus loops By: stimmins on Mon, 12 April 2004 13:14
		Re: vectorising versus loops By: David Fanning on Fri, 26 March 2004 11:47

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