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Re: Recognizing double precision? [message #56256 is a reply to message #56164]

Tue, 09 October 2007 08:11

edward.s.meinel@aero. is currently offline

edward.s.meinel@aero.
Messages: 52
Registered: February 2005

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On Oct 8, 9:18 am, wlandsman <wlands...@gmail.com> wrote:
> Bob, Bringfried,
>
>> Well, to play devil's advocate, the programmer should not let the
>> user input single precision data in such a case.
>
> Except that single precision or even a long integer (e.g. 2441636)
> *could* be valid, if the user was not interested in fractional
> days. I agree that it is probably safest to force the user to
> input double precision, but this does not feel like the "IDL way".
> Thanks, --Wayne

Actually, it gets rounded:

IDL> jd = 2441636.1
IDL> print, jd, f='(f10.2)'
2441636.00
IDL> jd = 2441636.9
IDL> print, jd, f='(f10.2)'
2441637.00

You're right, that is not a good thing. Mathematica has been doing it
correctly for a long time, why can't IDL?

Ed M

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[Message index]

		Recognizing double precision? By: wlandsman on Fri, 05 October 2007 08:12
		Re: Recognizing double precision? By: edward.s.meinel@aero. on Wed, 10 October 2007 11:21
		Re: Recognizing double precision? By: R.G.Stockwell on Wed, 10 October 2007 08:53
		Re: Recognizing double precision? By: edward.s.meinel@aero. on Wed, 10 October 2007 07:07
		Re: Recognizing double precision? By: R.G.Stockwell on Tue, 09 October 2007 08:50
		Re: Recognizing double precision? By: Maarten[1] on Tue, 09 October 2007 08:24
		Re: Recognizing double precision? By: edward.s.meinel@aero. on Tue, 09 October 2007 08:11
		Re: Recognizing double precision? By: R.Bauer on Wed, 24 October 2007 11:15

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