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Re: IDL 8.2.2 and PLOT with NaN values [message #83697 is a reply to message #83696]

Wed, 27 March 2013 14:10

wlandsman
Messages: 743
Registered: June 2000

Senior Member

Not only are the math errors hardware dependent, but today I came across the fact that it can depend on how the array is ordered.

IDL> print,min([2.,!values.f_nan,3.])
2.00000
IDL> print,min([!values.f_nan,3.,2.])
NaN
IDL> print,!version
{ x86_64 linux unix linux 8.2.2 Jan 23 2013 64 64}

The help for MIN says
"Note: If the MIN function is run on an array containing NaN values and the NAN keyword is not set, an invalid result will occur."

but this should probably read

Note: If the MIN function is run on an array containing NaN values and the NAN keyword is not set, an invalid result **may** occur.

On Wednesday, March 27, 2013 5:39:22 AM UTC-4, Fabien wrote:

> Quoting IDL help:
>
>
>
> "The detection of math errors, such as division by zero, overflow, and
>
> attempting to take the logarithm of a negative number, is hardware and
>
> operating system dependent."
>
>
>
> http://www.exelisvis.com/docs/Math_Errors.html

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[Message index]

		Re: IDL 8.2.2 and PLOT with NaN values By: chris_torrence@NOSPAM on Fri, 29 March 2013 08:36
		Re: IDL 8.2.2 and PLOT with NaN values By: Lajos Foldy on Wed, 27 March 2013 14:39
		Re: IDL 8.2.2 and PLOT with NaN values By: wlandsman on Wed, 27 March 2013 14:10
		Re: IDL 8.2.2 and PLOT with NaN values By: Karlo Janos on Wed, 27 March 2013 03:08
		Re: IDL 8.2.2 and PLOT with NaN values By: Fabzi on Wed, 27 March 2013 02:39
		Re: IDL 8.2.2 and PLOT with NaN values By: Karlo Janos on Wed, 27 March 2013 01:21
		Re: IDL 8.2.2 and PLOT with NaN values By: Michael Galloy on Tue, 26 March 2013 11:21
		Re: IDL 8.2.2 and PLOT with NaN values By: Karlo Janos on Tue, 26 March 2013 10:05
		Re: IDL 8.2.2 and PLOT with NaN values By: Fabzi on Tue, 26 March 2013 09:44
		Re: IDL 8.2.2 and PLOT with NaN values By: Karlo Janos on Tue, 02 April 2013 00:13

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