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Re: do SMOOTH not on all data [message #32690 is a reply to message #32685]

Wed, 30 October 2002 08:10

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Oesch (oesch@giub.unibe.ch) writes:

> I just want to use SMOOTH on a 2D array. But some data are bad (-9999)
> and should not be considered in the smoothing process. Well trying to
> assign those bad data like this
> novalid=WHERE(array NE -9999)
> result=SMOOTH(array(novalid),5)
>
> DOES not work.
>
> I think the solution is using 'NaN' option, but how to I assign -9999 as
> NaN as the !VALUES.F_NAN is write protected?

You want something like this:

arrayCopy = array
bad = Where(arrayCopy EQ -9999, count)
IF count GT 0 THEN arrayCopy[bad] = !Values.F_NAN
smoothedArray = Smooth(arrayCopy, /NAN, 5)

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: do SMOOTH not on all data By: air_jlin on Wed, 30 October 2002 17:16
		Re: do SMOOTH not on all data By: David Fanning on Wed, 30 October 2002 08:10
		Re: do SMOOTH not on all data By: mchinand on Wed, 30 October 2002 08:05

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