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Re: NULL value in IDL ? [message #42323 is a reply to message #42321]

Tue, 01 February 2005 11:30

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Jerome Colin writes:

> Is there in IDL a way to give a variable the value NULL, meaning 'no data' ?
> My problem is that I use REBIN() to reduce an image, but some parts of
> this image do not contain information, even is the value is zero. These
> zero-value pixels are hence taken into account in the REBIN()
> calculation, and that's what I would like to avoid.

REBIN seems to work OK with NANs:

a = findgen(5, 5)
a[1,1] = !Values.F_NAN
b = Rebin(a, 10, 10)
print, b

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: NULL value in IDL ? By: K. Bowman on Wed, 02 February 2005 07:03
		Re: NULL value in IDL ? By: Jerome Colin on Wed, 02 February 2005 00:58
		Re: NULL value in IDL ? By: Jerome Colin on Wed, 02 February 2005 00:28
		Re: NULL value in IDL ? By: David Fanning on Tue, 01 February 2005 11:30

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