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Re: Incorrect behavior of /NAN [message #30024 is a reply to message #30021]

Thu, 04 April 2002 10:38

Jaco van Gorkom
Messages: 97
Registered: November 2000

Member

"Paul van Delst" <paul.vandelst@noaa.gov> wrote in message
news:3CAC9914.B52D1669@noaa.gov...
> Kenneth Bowman wrote:
>> ....
>> IDL> print, mean([a, a], /nan)
>> NaN
>
> I think the last result *here* is wrong :o) Shouldn't it be 1.0? What is
MEAN in this case
> but:
>
> total([a,a],/NAN) / n_elements(non-nan values only)
>
> Both the numerator and denominator are 0.

So you mean that 0 / 0 = 1.0 ? Or 0. / 0. = 1.0 ?
In any case, IDL seems to disagree with you here: :-)

IDL> print, 0./0.
-NaN
% Program caused arithmetic error: Floating illegal operand

IDL> print, 0/0
0
% Program caused arithmetic error: Integer divide by 0

Jaco

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[Message index]

		Re: Incorrect behavior of /NAN By: Paul van Delst on Thu, 04 April 2002 11:38
		Re: Incorrect behavior of /NAN By: Jaco van Gorkom on Thu, 04 April 2002 10:38
		Re: Incorrect behavior of /NAN By: Paul van Delst on Thu, 04 April 2002 10:19
		Re: Incorrect behavior of /NAN By: Craig Markwardt on Thu, 04 April 2002 09:32
		Re: Incorrect behavior of /NAN By: K. Bowman on Fri, 05 April 2002 10:20
		Re: Incorrect behavior of /NAN By: Mark Hadfield on Thu, 04 April 2002 13:06
		Re: Incorrect behavior of /NAN By: Craig Markwardt on Thu, 04 April 2002 18:26

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