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Re: Unknown #INFO [message #13446 is a reply to message #13433]

Thu, 12 November 1998 00:00

korpela
Messages: 59
Registered: September 1993

Member

In article <MPG.10b3c2392717b0898971a@news.frii.com>,
David Fanning <davidf@dfanning.com> wrote:
>
> IDL> Help, !Values, /Structure
> ** Structure !VALUES, 4 tags, length=24:
> F_INFINITY FLOAT 1.#INF0
> F_NAN FLOAT 1.#QNAN
> D_INFINITY DOUBLE 1.#INF000
> D_NAN DOUBLE 1.#QNAN00
>
> I don't know. This may be a Windows thing. Looks a little
> Bill Gatesh, doesn't it. :-)

Yes it does look windowish. It probably has something to do
with the compiler they used to make their windows version. What
concerns me is how this affects reading and writing of text files.
In the past I have relied on IDL correctly parsing 'Inf' and 'NaN'
in input files. You can see the obvious portability problem.

I'm not sure if IEEE specifies the text representation of 'Inf'
and 'NaN' or if a program is required to be able to correctly parse
them on input.

Out of curiousity, could you try the following?

print,float('Inf')
print,float('1.#INF0')

(I'm guessing that this will give the same result as read on the same strings.)

My sun gives this:
IDL> print,!version
{ sparc sunos unix 5.0 Apr 28 1997}
IDL> print,!values
{ Inf NaN Infinity NaN}
IDL> print,float('Inf')
Inf
IDL> print,float('1.#INF0')
1.00000

Thanks,

Eric

--
Eric Korpela | An object at rest can never be
korpela@ssl.berkeley.edu | stopped.
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[Message index]

		Re: Unknown #INFO By: davidf on Fri, 13 November 1998 00:00
		Re: Unknown #INFO By: mgs on Thu, 12 November 1998 00:00
		Re: Unknown #INFO By: mallors on Thu, 12 November 1998 00:00
		Re: Unknown #INFO By: Martin Schultz on Thu, 12 November 1998 00:00
		Re: Unknown #INFO By: davidf on Thu, 12 November 1998 00:00
		Re: Unknown #INFO By: steinhh on Thu, 12 November 1998 00:00
		Re: Unknown #INFO By: korpela on Thu, 12 November 1998 00:00
		Re: Unknown #INFO By: davidf on Wed, 11 November 1998 00:00
		Re: Unknown #INFO By: korpela on Wed, 11 November 1998 00:00
		Re: Unknown #INFO By: davidf on Wed, 11 November 1998 00:00

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