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Re: VALUE_LOCATE and NaNs [message #81824 is a reply to message #81823]

Thu, 25 October 2012 02:34

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

Le jeudi 25 octobre 2012 11:14:47 UTC+2, Fab a écrit :
> Dear IDLers,
>
>
>
> I am quite an adept of using NaNs as missing values for my data, because
>
> many IDL routines go along with them. However, some of the routines are
>
> not really documented about how they handle NaNs.
>
> See the following example:
>
>
>
> IDL> data = FINDGEN(10) & data[0] = !VALUES.F_NAN
>
> IDL> p = VALUE_LOCATE(FINDGEN(10), data) & print, p[0]
>
> -1
>
> IDL> p = VALUE_LOCATE(INDGEN(10), data) & print, p[0]
>
> 0
>
> % Program caused arithmetic error: Floating illegal operand
>
>
>
> Which is quite dangerous! If I didn't debug my code to find the origin
>
> of the Floating illegal operand warning, value_locate's output would be
>
> wrong.
>
>
>
> Someone else than me thinking of this as a bug?
>
>
>
> Thanks,
>
>
>
> Fab

Please note that:
IDL> p = VALUE_LOCATE(LINDGEN(10), data) & print, p[0]
-1
gives the correct result.

alx.

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[Message index]

		Re: VALUE_LOCATE and NaNs By: Fabzi on Thu, 25 October 2012 08:07
		Re: VALUE_LOCATE and NaNs By: Jeremy Bailin on Thu, 25 October 2012 08:05
		Re: VALUE_LOCATE and NaNs By: wlandsman on Thu, 25 October 2012 08:01
		Re: VALUE_LOCATE and NaNs By: lecacheux.alain on Thu, 25 October 2012 07:59
		Re: VALUE_LOCATE and NaNs By: Craig Markwardt on Thu, 25 October 2012 07:30
		Re: VALUE_LOCATE and NaNs By: Fabzi on Thu, 25 October 2012 06:48
		Re: VALUE_LOCATE and NaNs By: Kai Muehlbauer on Thu, 25 October 2012 06:41
		Re: VALUE_LOCATE and NaNs By: lecacheux.alain on Thu, 25 October 2012 04:10
		Re: VALUE_LOCATE and NaNs By: Fabzi on Thu, 25 October 2012 02:57
		Re: VALUE_LOCATE and NaNs By: lecacheux.alain on Thu, 25 October 2012 02:34

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