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Re: PSF Energy inside circle [message #61708 is a reply to message #61664]

Fri, 25 July 2008 10:18

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article
<808314ce-4419-478d-8593-bc94dd7f1789@p25g2000hsf.googlegroups.com>,
Bob Crawford <Snowman42@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

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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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