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Re: PSF Energy inside circle [message #61751 is a reply to message #61708]

Tue, 29 July 2008 08:38

Bob[3]
Messages: 60
Registered: December 2006

Member

On Jul 25, 1:18 pm, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
> In article
> < 808314ce-4419-478d-8593-bc94dd7f1...@p25g2000hsf.googlegroup s.com >,
> Bob Crawford <Snowma...@gmail.com> wrote:
>
>> Is there an advantage of using this method to determine d over using
>> DIST?
>
> DIST computes a different function.
>
> !P.MULTI = [0, 2, 1]
> x = FINDGEN(51)
> xx = REBIN(x, 51, 51)
> yy = REBIN(REFORM(x, 1, 51), 51, 51)
> d = SQRT((xx - 25.0)^2 + (yy - 25.0)^2)
> SURFACE, d
> SURFACE, DIST(51)
>
> The Euclidian distance is a circular cone. DIST computes an
> array proportional to the frequency of each element.
>
> Ken Bowman

Thank you - but I was referring to the simplified situation as
described in this post:
http://groups.google.ca/group/comp.lang.idl-pvwave/browse_th read/thread/69b7be558f84e5be/2c185f37b1f50503?hl=en&lnk= gst#2c185f37b1f50503

i.e. replace:
SURFACE, DIST(51)

with:
SURFACE, SHIFT(DIST(51),25,25)

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[Message index]

		Re: PSF Energy inside circle By: wlandsman on Wed, 23 July 2008 13:52
		Re: PSF Energy inside circle By: pgrigis on Wed, 23 July 2008 13:24
		Re: PSF Energy inside circle By: Kenneth P. Bowman on Wed, 23 July 2008 12:17
		Re: PSF Energy inside circle By: pgrigis on Wed, 23 July 2008 11:15
		Re: PSF Energy inside circle By: Bob[3] on Thu, 24 July 2008 05:43
		Re: PSF Energy inside circle By: Kenneth P. Bowman on Fri, 25 July 2008 10:18
		Re: PSF Energy inside circle By: Bob[3] on Tue, 29 July 2008 08:38
		Re: PSF Energy inside circle By: maye on Wed, 30 July 2008 15:06

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