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Re: Mean preserving interpolation (conservative interpolation) [message #81798 is a reply to message #81795]

Tue, 16 October 2012 10:14

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Tuesday, October 16, 2012 12:52:39 PM UTC-4, Coyote wrote:
>
>
> The keyword you are looking for is MINUS_ONE:
>
>

While the /MINUS_ONE keyword works for your particular example, I don't believe it is a general solution. I'd suggest frebin.pro ( http://idlastro.gsfc.nasa.gov/ftp/pro/image/frebin.pro ) as a flux-conserving alternative to CONGRID.

IDL> x = randomn(seed,100)*10
IDL> y = congrid(x,367,/minus_one,/interp)
IDL> z = frebin(x,367)
IDL> print,mean(x),mean(y),mean(z)
-0.593289 -0.546786 -0.593280

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[Message index]

		Re: Mean preserving interpolation (conservative interpolation) By: Brigitte on Wed, 17 October 2012 02:35
		Re: Mean preserving interpolation (conservative interpolation) By: wlandsman on Tue, 16 October 2012 10:14
		Re: Mean preserving interpolation (conservative interpolation) By: DavidF[1] on Tue, 16 October 2012 09:52

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