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Re: GDL weirdness (bug?) with modulo command [message #88357 is a reply to message #88345]

Wed, 16 April 2014 12:14

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Wednesday, April 16, 2014 3:55:15 AM UTC-4, rj...@le.ac.uk wrote:
> Yeah, that's why I posted here rather than submitting a GDL bug report. I thought it might be some subtlety like that which wasn't actually a bug. However, mod behaves as I'd expect in IDL and it's only GDL with this issue.
>
>
>
> I think that points to a bug or dodgy implementation in GDL...?

Let's use your example.

print, (200.0 MOD 12) - 8.0

On IDL the result is 0.0. I agree, that's the expected value, because floating point should be able to calculate this exactly. But I would also argue that any value within 0 +/- EPS is consistent with 0.

Craig

EPS = (machar()).eps

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[Message index]

		GDL weirdness (bug?) with modulo command By: rjp23 on Tue, 15 April 2014 07:44
		Re: GDL weirdness (bug?) with modulo command By: Craig Markwardt on Tue, 15 April 2014 11:50
		Re: GDL weirdness (bug?) with modulo command By: rjp23 on Wed, 16 April 2014 00:55
		Re: GDL weirdness (bug?) with modulo command By: Craig Markwardt on Wed, 16 April 2014 12:14
		Re: GDL weirdness (bug?) with modulo command By: rjp23 on Wed, 16 April 2014 03:32
		Re: GDL weirdness (bug?) with modulo command By: Alain Coulais on Tue, 29 April 2014 02:17
		Re: GDL weirdness (bug?) with modulo command By: rjp23 on Thu, 08 May 2014 13:36

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