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Re: NaN problem in integer arrays [message #86207 is a reply to message #86206]

Thu, 17 October 2013 08:50

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Galaxytraveler writes:

> I use NaN's a lot in my arrays in place of missing or bad data points,
> but I have problems with it everytime my arrays are integer.

Yes, there are only two types of NaNs in IDL. !Values.F_NaN
is the floating point NaN (that is what the F means) and !Values.D_NaN
is a double precision floating point NaN (that is what the D means).
There is no integer or long or byte value that can be used as a NaN.

Bottom line, if you are going to use NaNs, you will need to use them in
floating point or double precision arrays. No way around it. :-)

> I can see that other people have had troubles with this and explained
it as a windows compiler errors, but I have a mac computer.
> http://www.idlcoyote.com/math_tips/nans.html

That's funny! :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		NaN problem in integer arrays By: galaxytraveler42 on Thu, 17 October 2013 08:44
		Re: NaN problem in integer arrays By: David Fanning on Thu, 17 October 2013 08:50
		Re: NaN problem in integer arrays By: Kenneth Bowman on Thu, 17 October 2013 13:51

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