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Re: GDL weirdness (bug?) with modulo command [message #88336 is a reply to message #88331]

Tue, 15 April 2014 11:50

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Tuesday, April 15, 2014 10:44:33 AM UTC-4, rj...@le.ac.uk wrote:
> I'm not sure if this is a bug or if I'm missing something and I know there's a fair few GDL users here.
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>
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> I was using the mod command to get the remainder from a value and then fixing it to be an integer and I noticed that some of the values were wrong.
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> I looked into it a bit more and think I can summarise the issue as:
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> GDL> print, 200.0 mod 12
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> 7.99999
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> GDL> print, 200D mod 12
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> 8.0000000
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> i.e. if the variable is a float, the mod command doesn't return the integer that you expect it to. If it's a double then you get the expected answer.
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> Am I missing some subtlety here or is this a bug?

This is probably the issue...
https://www.idlcoyote.com/math_tips/sky_is_falling.html

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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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