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Re: Vectorizing Code [message #29664 is a reply to message #29529]

Thu, 28 February 2002 07:43

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

In article <a5kg1a$i7m$1@mwrns.noaa.gov>,
"Pavel Romashkin" <pavel_romashkin@hotmail.com> wrote:

> From: "Kenneth P. Bowman" <kpb@null.com>
>
>> sa = 10.^2*EXP(-ABS(REBIN(LINDGEN(nstate), nstate, nvec, /SAMPLE) - $
>> REBIN(REFORM(LINDGEN(nvec), 1, nvec), nstate, nvec, /SAMPLE))*dz/h)
>
> I am afraid I'd rather stick with the optimized loops than something that
> takes me five minutes to figure out :-(
> Pavel

I used to feel as you, lost among the REBINs and HISTOGRAMS with
REVERSE_INDICES, but I have read the REBIN tutorial,
brothers and sisters, and I have seen the light!
(Admittedly, it was a 40 W appliance bulb.) It was understanding
the REFORM call that makes this a useful approach for me.

I was recently computing some conditional probability distributions,
and using REVERSE_INDICES sped things up by about a factor of 10
over repeated WHERE's.

To paraphrase Scott Turow, I'm just "learning to love IDL".

Ken

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[Message index]

		Re: Vectorizing Code By: marc schellens[1] on Wed, 27 February 2002 22:17
		Re: Vectorizing Code By: Pavel Romashkin on Wed, 27 February 2002 21:43
		Re: Vectorizing Code By: Kenneth P. Bowman on Wed, 27 February 2002 18:56
		Re: Vectorizing Code By: Jeff Guerber on Wed, 27 February 2002 16:00
		Re: Vectorizing Code By: K. Bowman on Thu, 28 February 2002 07:43
		Re: Vectorizing Code By: James Tappin on Thu, 28 February 2002 08:35

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