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Re: Problem with dist function in IDL [message #55318 is a reply to message #55314]

Sun, 12 August 2007 17:48

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On Aug 12, 8:41 am, ATKT <ankur.trigun...@gmail.com> wrote:
> Can somebody tell what exactly dist function is doing in IDL
> e.g x=dist(2,2)
> 0.000000 1.00000
> 1.00000 1.41421
> What is the meaning of this ouput
> x=dist(4,4)
> 0.000000 1.00000 2.00000 1.00000
> 1.00000 1.41421 2.23607 1.41421
> 2.00000 2.23607 2.82843 2.23607
> 1.00000 1.41421 2.23607 1.41421
>
> I am unable to understand the out put which is being generated.

The online help says this:

"The DIST function creates an array in which each array element value
is proportional to its frequency. This array may be used for a variety
of purposes, including frequency-domain filtering."

But I think about it in terms of plain Euclidean distance. Each array
element's value is the shortest distance to (0, 0) allowing for
wrapping around the edges. This has applications in creating kernels
for image processing filters (and is simple dataset for examples).

Mike
--
www.michaelgalloy.com

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[Message index]

		Re: Problem with dist function in IDL By: Paolo Grigis on Thu, 16 August 2007 03:13
		Re: Problem with dist function in IDL By: Jean H. on Wed, 15 August 2007 17:34
		Re: Problem with dist function in IDL By: cgguido on Wed, 15 August 2007 16:23
		Re: Problem with dist function in IDL By: Paolo Grigis on Mon, 13 August 2007 03:06
		Re: Problem with dist function in IDL By: Michael Galloy on Sun, 12 August 2007 17:48
		Re: Problem with dist function in IDL By: David Fanning on Tue, 28 August 2007 11:26

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