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Re: Why is MEAN so slow? [message #74498 is a reply to message #74497]

Tue, 18 January 2011 17:36

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Tuesday, January 18, 2011 7:52:45 PM UTC-5, Matthew Francis wrote:
> I've been using the PROFILER to track down why some code was a bit
> slow and found that it was spending most of its time in the MEAN
> function (and then within that, in the MOMENT function called by
> MEAN).
>
In IDL 8.0, MEAN no longer calls MOMENT but does the calculation itself using code similar to your MEAN_QUICK. (This is part of the upgrade that also added a DIMENSION keyword.)

But I don't see anything inefficient about the earlier code which called MOMENT(). In fact, I find the same processing times whether using MEAN_QUICK, the pre-8.0 MEAN(), or the V8.0 MEAN(). (My test consisted of taking the mean of a 5000 x 5000 randomn array with selected values set to NAN.)

--Wayne

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[Message index]

		Re: Why is MEAN so slow? By: Matt Francis on Wed, 19 January 2011 14:06
		Re: Why is MEAN so slow? By: Foldy Lajos on Wed, 19 January 2011 11:49
		Re: Why is MEAN so slow? By: wlandsman on Wed, 19 January 2011 11:08
		Re: Why is MEAN so slow? By: Matt Francis on Tue, 18 January 2011 18:14
		Re: Why is MEAN so slow? By: wlandsman on Tue, 18 January 2011 17:36

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