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Re: where function not finding value [message #90570 is a reply to message #90568]

Tue, 10 March 2015 13:19

Burch
Messages: 28
Registered: December 2013

Junior Member

On Tuesday, March 10, 2015 at 3:15:18 PM UTC-5, Jahvasc wrote:
> Hi, Chris, thank you for your answer. But it was to avoid this floating point problems that I'm using the intervals. Besides, why when I write down the interval (mass gt 0.04 and mass le 0.05) I got the the right answer?

Unfortunately you're not quite avoiding those issues. For instance, analogous to what you're doing try this

IDL> print, 0.05 le 4.0*0.01+0.01
0

IDL> print, 0.05 le 0.05
1

The first example *should* return 1 in a perfect world, but once you do mathematical operations (such as the multiplication and addition) you will introduce floating point arithmetic issues.

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[Message index]

		where function not finding value By: mboggsk9 on Thu, 03 April 2014 10:44
		Re: where function not finding value By: Mats Löfdahl on Thu, 03 April 2014 10:57
		Re: where function not finding value By: David Fanning on Thu, 03 April 2014 11:29
		Re: where function not finding value By: Phillip Bitzer on Thu, 03 April 2014 11:44
		Re: where function not finding value By: mboggsk9 on Thu, 03 April 2014 14:15
		Re: where function not finding value By: Jahvasc on Tue, 10 March 2015 11:12
		Re: where function not finding value By: David Fanning on Tue, 10 March 2015 11:42
		Re: where function not finding value By: Jahvasc on Tue, 10 March 2015 13:06
		Re: where function not finding value By: David Fanning on Tue, 10 March 2015 13:15
		Re: where function not finding value By: chris_torrence@NOSPAM on Tue, 10 March 2015 12:01
		Re: where function not finding value By: Jahvasc on Tue, 10 March 2015 13:15
		Re: where function not finding value By: Burch on Tue, 10 March 2015 13:19
		Re: where function not finding value By: chris_torrence@NOSPAM on Tue, 10 March 2015 19:34
		Re: where function not finding value By: Jahvasc on Wed, 11 March 2015 02:16
		Re: where function not finding value By: Craig Markwardt on Wed, 11 March 2015 07:06
		Re: where function not finding value By: Phillip Bitzer on Wed, 11 March 2015 09:24

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