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Re: JULDAY 5.4 not same as 5.3? [message #24053 is a reply to message #23992]

Mon, 05 March 2001 10:03

pit
Messages: 92
Registered: January 1996

Member

Don Woodraska <don.woodraska@lasp.colorado.edu> writes:
> I've pinpointed the problem.
>
> SUMMARY:
> ***
> The bug appears only with unsigned-long and unsigned-64-bit-long
> hour argument to JULDAY.

Hm, this is a much more general problem of unsigned data types, I
stumbled across it myself just two weeks ago.

I'm still not sure who's to blame, me (i.e. the programmer) or
IDL/RSI, but in general it does not make sense to take a negative of a
unsigned number, and IMHO there should also occur an automatic type
conversion as soon as a minus sign is involved. Currently, you get e.g.

IDL> x=5b
IDL> print,-x
251

Any comments on that?

Peter

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~
Dr. Peter "Pit" Suetterlin http://www.astro.uu.nl/~suetter
Sterrenkundig Instituut Utrecht
Tel.: +31 (0)30 253 5225 P.Suetterlin@astro.uu.nl
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[Message index]

		JULDAY 5.4 not same as 5.3? By: Don Woodraska on Thu, 01 March 2001 15:00
		Re: JULDAY 5.4 not same as 5.3? By: pit on Tue, 06 March 2001 09:23
		Re: JULDAY 5.4 not same as 5.3? By: Mark Hadfield on Mon, 05 March 2001 14:57
		Re: JULDAY 5.4 not same as 5.3? By: Craig Markwardt on Mon, 05 March 2001 14:22
		Re: unsigned int woes (was: JULDAY 5.4 not same as 5.3?) By: Martin Schultz on Mon, 19 March 2001 06:19
		Re: JULDAY 5.4 not same as 5.3? By: pit on Mon, 05 March 2001 10:03
		Re: JULDAY 5.4 not same as 5.3? By: Mark Hadfield on Sun, 04 March 2001 12:14

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