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Re: TOTAL() and NaNs, again [message #83727]

Tue, 26 March 2013 08:48

Kenneth Bowman
Messages: 86
Registered: November 2006

Member

On 2013-03-25 21:30:30 +0000, Fabien said:

> Dear IDLers,
>
> To be honest, this is described in the Doc: "Since the value NaN is
> treated as missing data, if Array contains only NaN values the TOTAL
> routine will return 0."
>
> But I don't see why it is so. This is not coherent with what one would
> expect TOTAL to do: the sum of all the elements in the array...
>
> Anyone to convince me that TOTAL() *has* to return 0 in this case?

When this was introduced I argued that it was implemented wrong.
(Others disagreed with me.) As it is, it nullifies the value of the
NAN keyword by requiring the user to check for the special case where
all of the elements are NANs.

So, most of the time I find the NAN keyword to be useless for TOTAL.

Ken Bowman

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[Message index]

		Re: TOTAL() and NaNs, again By: Kenneth Bowman on Tue, 26 March 2013 08:48
		Re: TOTAL() and NaNs, again By: Jeremy Bailin on Tue, 26 March 2013 07:30
		Re: TOTAL() and NaNs, again By: ben.bighair on Mon, 25 March 2013 19:06
		Re: TOTAL() and NaNs, again By: Craig Markwardt on Mon, 25 March 2013 16:35

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