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Re: BYTSCL and NAN keyword [message #38276 is a reply to message #38273]

Tue, 02 March 2004 09:39

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Kenneth Bowman <k-bowman@null.tamu.edu> writes:

> Has anyone else noticed this problem with BYTSCL and the NAN keyword?
>
> The BYTSCL function scales integers and floats into bytes between 0 and
> 255 (or the value set by the TOP keyword). If the NAN keyword is set,
> NANs in the input array are set to 0 in the output array. But 0 falls
> into the valid range for good values (0 to TOP)!
...

How about this non-WHERE approach?
bb = bytscl(x, ...) + (finite(x) EQ 0)*255b

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: BYTSCL and NAN keyword By: David Fanning on Tue, 02 March 2004 15:48
		Re: BYTSCL and NAN keyword By: Kenneth P. Bowman on Tue, 02 March 2004 15:18
		Re: BYTSCL and NAN keyword By: David Fanning on Tue, 02 March 2004 14:07
		Re: BYTSCL and NAN keyword By: JD Smith on Tue, 02 March 2004 13:32
		Re: BYTSCL and NAN keyword By: Craig Markwardt on Tue, 02 March 2004 09:39
		Re: BYTSCL and NAN keyword By: David Fanning on Tue, 02 March 2004 09:45
		Re: BYTSCL and NAN keyword By: K. Bowman on Tue, 02 March 2004 09:26
		Re: BYTSCL and NAN keyword By: David Fanning on Tue, 02 March 2004 09:18
		Re: BYTSCL and NAN keyword By: Edd Edmondson on Tue, 02 March 2004 09:13
		Re: BYTSCL and NAN keyword By: K. Bowman on Wed, 03 March 2004 07:26
		Re: BYTSCL and NAN keyword By: Kenneth P. Bowman on Tue, 02 March 2004 17:44

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