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MathGroup Archive 1992

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Re: Why does this crash the kernel?

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Re: Why does this crash the kernel?
  • From: David Withoff <withoff>
  • Date: Fri, 31 Jul 1992 14:59:33 -0500

> The following file crashes a sun kernel and a mac kernel.
> 
> b1 = Sqrt[2] x (500000 - 375 2^(5/2) x + 2 x^2 - 1000 p + 
> 1.5 Sqrt[2] x p + 0.5 p^2)/(1000 - Sqrt[2] x - p);
> 
> a1 = (500000 - 125 2^(7/2) x + x^2 - 2000 p + 2^(3/2) x p + 
> 1.5 p^2)/(1000 - Sqrt[2] x - p);
> 
> e = 0.125 b1^2  - 0.125 a1^2;
> kk = Simplify[e/.p->190];
> 
> Solve[kk==0,x]
> 
> Any workarounds?
> 
> Howard Fink

If what you need are the zeros of kk, you can get them using FindRoot:

In[7]:= FindRoot[kk, {x, 0}]

Out[7]= {x -> 0.375406}
 
In[9]:= FindRoot[kk, {x, -1}]

Out[9]= {x -> -0.375349}

The crash problem in Solve (it's actually in NRoots) will be fixed in
the next release.

Dave Withoff
withoff at wri.com





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