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Re: MISSING_VALUE [message #43344 is a reply to message #43250]

Wed, 30 March 2005 05:52

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Matthias Demuzere writes:

> Now the problem has moved. When the dataset is initially read in with
> read_ascii, I get the value NaN where it should....
>
> BUT....I declare empty arrays (with zero's) in which I put a part of the
> original array. So where there is the value NaN, my new array now shows
> 0....Any solutions?
> Hope I made myself clear!

In general, setting missing values to NaN should probably be done
in the last stage of data preparation, if possible, since it is
typically MUCH easier to work with numbers than with, well, not
numbers. I would probably set the missing values from READ_ASCII
to something easily recognizable as not a valid value (e.g.
-99999.9) and do all your array manipulation with these
numbers. Then, at the end, find all the -99999.9s and turn
them into NaNs.

The only other solution you have is to find the NaNs in your
original array and set the corresponding values in your new
array to NaN. But that is harder to do:

http://www.dfanning.com/tips.check_nan.html

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: MISSING_VALUE By: Benjamin Luethi on Tue, 29 March 2005 23:26
		Re: MISSING_VALUE By: Matthias Demuzere on Tue, 29 March 2005 23:10
		Re: MISSING_VALUE By: David Fanning on Tue, 29 March 2005 07:34
		Re: MISSING_VALUE By: David Fanning on Tue, 29 March 2005 07:33
		Re: MISSING_VALUE By: Matthias Demuzere on Tue, 29 March 2005 07:24
		Re: MISSING_VALUE By: David Fanning on Tue, 29 March 2005 07:05
		Re: MISSING_VALUE By: edward.s.meinel@aero. on Thu, 31 March 2005 06:27
		Re: MISSING_VALUE By: David Fanning on Wed, 30 March 2005 05:52

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