Re: Zero or not?

[Robert A. Macy]

matrix u...

>> u(abs(u)<10*eps)=0;

worked for me.

On Sat, 21 Jul 2007 18:45:08 +0200
 Matthias Brennwald <address@hidden> wrote:
> Ok. Is there a way to predict the expected offset? I need
> to test if  
> the sums across the columns of a matrix are zero, or at
> least within  
> the bounds expected from the IEEE arithmetic.
> 
> Matthias
> 
> 
> On 21.07.2007, at 15:17, Jordi Gutiérrez Hermoso wrote:
> 
> > On 21/07/07, Matthias Brennwald
> <address@hidden> wrote:
> >> I expected the below code to yield only zeros, but it
> does not:
> >
> > That's just the way IEEE arithmetic works. When
> subtracting two
> > numbers that are very close, you may not get zero, just
> machine
> > epsilon. Try this, for fun: 0.3 - 0.2 - 0.1
> >
> > - Jordi G. H.
> 
> 
> 
> 
> -------
> Matthias Brennwald
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> 
> 
> 
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