Zero division error!

Prem Rachakonda prem at engr.uky.edu
Fri Aug 3 02:21:46 CEST 2001


Hi,
   That was a perfect guess. I intialized d with zeros(). Initially I
didn't use 'Float'. But now even when I use Float it doesn't work. I
think, I have a bug in my code..and my not be in Python...Let me
check..

Thanks,
Prem.
"Tim Hochberg" <tim.hochberg at ieee.org> wrote in message news:<oCga7.75798$Cy.10897029 at news1.rdc1.az.home.com>...
> "Prem Rachakonda" <prem at engr.uky.edu> wrote in message
> news:Pine.LNX.4.21.0108021330570.19621-100000 at seahawk.ecc.engr.uky.edu...
> > Hi,
> >   I am writing a script for 'cubic spline interpolation' and when there is
> > a float value = 0.004, it is rounded off to zero and I am getting a Zero
> > Division error. Is it a python bug?
> >
> > Prem.
> >
> > x=array([2.056, 2.06, 2.064, 2.068, 2.072, 2.076, 2.08, 2.084, 2.088,
> > 2.092, 2.096, 2.1, 2.104])
> > ..
> > ..
> > ..
> > d[0]=x[1]-x[0]
> > c[1]=(y[1]-y[0])/d[0]
> >
> > Here d[0] is 0.004(equally spaced points) and is being considered as 0 and
> > I am getting this error.
> 
> 
> You haven't posted enough code to be sure, but I'm going to make some
> guesses.
> 
> (1) array is Numeric.array
> (2) d is created in a way similar to zeros([N])
> 
> If that's the case, what happening is that d is an array of ints, not floats
> (int is the default). That means that when attributes are set using floats,
> they are silently truncated to ints in the array. This is somewhat of a
> misfeature of Numeric in my opinion, but I don't think it's actually a bug.
> Assuming that your are actually using zeros to create d, you could use
> Numeric.zeros([N], Numeric.Float) instead.
> 
> Then again, this is all a guess.
> 
> -tim



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