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Re: Avoid loop in matrix operation [message #49196 is a reply to message #49195]

Fri, 07 July 2006 12:09

George N. White III is currently offline

George N. White III
Messages: 56
Registered: September 2000

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On Thu, 6 Jul 2006, JD Smith wrote:

> So how about a new function, called APPLY/COLLAPSE/REDUCE/whatever,
> which takes an array, a generic function (which accepts an array or
> vector argument and returns an array/vector/scalar with one fewer
> dimensions), and a dimension over which to apply that function. Then
> it runs through in a *tight* loop, applying that function and
> collating the results into a return array, with a minimum of loop
> overhead.

Other matrix languages have had this for years -- how far behind can IDL
stay without going backwards?

People following this thread might want to look at Matlab's recent
implementation of new functions to vectorize operations over heterogeneous
arrays and structures, described in
< http://www.mathworks.com/company/newsletters/digest/2006/mar /vector.html>

--
George N. White III <aa056@chebucto.ns.ca>

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[Message index]

		Re: Avoid loop in matrix operation By: JD Smith on Fri, 07 July 2006 13:46
		Re: Avoid loop in matrix operation By: George N. White III on Fri, 07 July 2006 12:09
		Re: Avoid loop in matrix operation By: greg michael on Thu, 06 July 2006 14:01
		Re: Avoid loop in matrix operation By: JD Smith on Thu, 06 July 2006 12:58
		Re: Avoid loop in matrix operation By: greg michael on Thu, 06 July 2006 04:55
		Re: Avoid loop in matrix operation By: L. Testut on Thu, 06 July 2006 03:56
		Re: Avoid loop in matrix operation By: greg michael on Thu, 06 July 2006 03:49

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