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Re: differences idl5.5 and idl5.6 [message #34074 is a reply to message #34073]

Wed, 19 February 2003 09:26

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

In article <b30ble$dpt7$1@zam602.zam.kfa-juelich.de>,
Reimar Bauer <R.Bauer@fz-juelich.de> wrote:

> on aix the result is a bit more different,
> IDL> a=1./0 & print,a,fix(a)
> Inf -1
>
>
> I would prefer as result NaN!

The IEEE standard defines distinct special values for Inf (result of
division by zero) and NaN (result of operations on Inf's and Nan's).
Being able to distinguish them is probably a good thing. The FINITE
function has keywords for this purpose. Without keywords, FINITE
detects both.

Unfortunately, perhaps, standard integer formats do not include
"special" values to represent inifinties, Nan's, etc. You have to
handle them yourself. Hence all those ASCII data sets filled with
-999's!

Conversion of IEEE Inf's and NaN's to integers may well be system
dependent.

Ken

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[Message index]

		Re: differences idl5.5 and idl5.6 By: R.G. Stockwell on Wed, 19 February 2003 10:17
		Re: differences idl5.5 and idl5.6 By: K. Bowman on Wed, 19 February 2003 09:26
		Re: differences idl5.5 and idl5.6 By: Paul Van Delst[1] on Wed, 19 February 2003 08:56
		Re: differences idl5.5 and idl5.6 By: R.Bauer on Wed, 19 February 2003 08:33
		Re: differences idl5.5 and idl5.6 By: Dick Jackson on Wed, 19 February 2003 07:54
		Re: differences idl5.5 and idl5.6 By: R.Bauer on Thu, 20 February 2003 01:01

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