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Re: Mean preserving interpolation (conservative interpolation) [message #81799 is a reply to message #81798]

Tue, 16 October 2012 09:52

DavidF[1]
Messages: 94
Registered: April 2012

Member

Brigitte writes:

> When I interpolate y=congrid(x,ny,/interp) an array, the mean of the original array (x) is different from the mean of the interpolated array (y). Is there a function or keyword to preserve the mean?

The keyword you are looking for is MINUS_ONE:

IDL> x = (Findgen(100)+1)*4
IDL> print, Mean(x)
202.000
IDL> print, mean(congrid(x, 200, /minus_one))
202.000
IDL> print, mean(congrid(x, 5250, /minus_one))
202.000
IDL> print, mean(congrid(x, 5250, /interp, /minus_one))
202.000
IDL> print, mean(congrid(x, 367, /interp, /minus_one))
202.000

Cheers,

David

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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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