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Re: Problem with dist function in IDL [message #55651 is a reply to message #55319]

Tue, 28 August 2007 13:10

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On Aug 28, 12:26 pm, David Fanning <n...@dfanning.com> wrote:
> I was just having a look at the BUTTERWORTH filter code in the IDL
> library, and I notice that the ITTVIS programmer who wrote this
> function uses the double FOR loop method to create the distance
> function, rather than DIST.
>
> What do you suppose he knows that we don't!?

Well, the BUTTERWORTH code has to handle 1, 2, or 3-dimensional
distance arrays, whereas DIST handles only the 2-dimensional case. So
BUTTERWORTH could use DIST for only one of the three cases, so the
developer decided not to use it? In any case, DIST is more efficient
than BUTTERWORTH for the 2-dimensional case.

Mike
--
www.michaelgalloy.com

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[Message index]

		Problem with dist function in IDL By: ATKT on Sun, 12 August 2007 07:41
		Re: Problem with dist function in IDL By: Michael Galloy on Tue, 28 August 2007 13:10
		Re: Problem with dist function in IDL By: Ken G on Tue, 05 January 2016 23:02

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