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MathGroup Archive 2005

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Re: Eigensystem Bug? OS-X

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56201] Re: [mg56101] Eigensystem Bug? OS-X
  • From: János <janos.lobb at yale.edu>
  • Date: Tue, 19 Apr 2005 04:54:58 -0400 (EDT)
  • References: <200504150847.EAA11575@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Well, on my 1.25 GHz G4  I started it on Friday morning and now on  
Monday morning it is still running.  It is the kernel that is using  
75=85 % of CPU time according to top under a pre-release of Tiger.   
The front end had no chance yet to participate in any action.  It  
consumed about 70MB of memory in the last three days - but that can  
be  caused also by other programs I run leaking memory.

János
On Apr 15, 2005, at 4:47 AM, Erich Mueller wrote:

> I have some strange behavior of Eigensystem and Eigenvectors [but not
> Eigenvalues] on my G5 running OS-X 10.3.8, and Mathematica 5.1.0.0.
>
> The Kernel Hangs when I try to calculate the Eigenvectors of the 18x18
> Matrix at the end of this message. [Its the smallest matrix for  
> which I
> have the problem.]  It does not respond to an "Abort Evaluation", or
> "Interupt Evaluation Signal", and I must kill it from the terminal.
>
> There is no problem finding the eigenvalues of this same matrix on  
> a PC.
>   Is there someone who can suggest a fix/workaround?  Failing that, is
> there anyone with a mac who can verify the problem?
>
> Thanks,
> Erich
>
>
> {{-4., 1., 1., 1., 0., 0., 1., 0., 0., 0., 0. + 1.*I, 0. + 1.*I, 0. -
> 1.*I, 0., 0., 0. - 1.*I, 0., 0.},
>   {1., -4., 1., 0., 1., 0., 0., 1., 0., 0. + 1.*I, 0., 0. + 1.*I,  
> 0., 0.
> - 1.*I, 0., 0., 0. - 1.*I, 0.},
>   {1., 1., -4., 0., 0., 1., 0., 0., 1., 0. + 1.*I, 0. + 1.*I, 0., 0.,
> 0., 0. - 1.*I, 0., 0., 0. - 1.*I},
>   {1., 0., 0., -4., 1., 1., 1., 0., 0., 0. - 1.*I, 0., 0., 0., 0. +
> 1.*I, 0. + 1.*I, 0. - 1.*I, 0., 0.},
>   {0., 1., 0., 1., -4., 1., 0., 1., 0., 0., 0. - 1.*I, 0., 0. + 1.*I,
> 0., 0. + 1.*I, 0., 0. - 1.*I, 0.},
>   {0., 0., 1., 1., 1., -4., 0., 0., 1., 0., 0., 0. - 1.*I, 0. +  
> 1.*I, 0.
> + 1.*I, 0., 0., 0., 0. - 1.*I},
>   {1., 0., 0., 1., 0., 0., -4., 1., 1., 0. - 1.*I, 0., 0., 0. - 1.*I,
> 0., 0., 0., 0. + 1.*I, 0. + 1.*I},
>   {0., 1., 0., 0., 1., 0., 1., -4., 1., 0., 0. - 1.*I, 0., 0., 0. -
> 1.*I, 0., 0. + 1.*I, 0., 0. + 1.*I},
>   {0., 0., 1., 0., 0., 1., 1., 1., -4., 0., 0., 0. - 1.*I, 0., 0.,  
> 0. -
> 1.*I, 0. + 1.*I, 0. + 1.*I, 0.},
>   {0., 0. - 1.*I, 0. - 1.*I, 0. + 1.*I, 0., 0., 0. + 1.*I, 0., 0., 4.,
> -1., -1., -1., 0., 0., -1., 0., 0.},
>   {0. - 1.*I, 0., 0. - 1.*I, 0., 0. + 1.*I, 0., 0., 0. + 1.*I, 0.,  
> -1.,
> 4., -1., 0., -1., 0., 0., -1., 0.},
>   {0. - 1.*I, 0. - 1.*I, 0., 0., 0., 0. + 1.*I, 0., 0., 0. + 1.*I,  
> -1.,
> -1., 4., 0., 0., -1., 0., 0., -1.},
>   {0. + 1.*I, 0., 0., 0., 0. - 1.*I, 0. - 1.*I, 0. + 1.*I, 0., 0.,  
> -1.,
> 0., 0., 4., -1., -1., -1., 0., 0.},
>   {0., 0. + 1.*I, 0., 0. - 1.*I, 0., 0. - 1.*I, 0., 0. + 1.*I, 0., 0.,
> -1., 0., -1., 4., -1., 0., -1., 0.},
>   {0., 0., 0. + 1.*I, 0. - 1.*I, 0. - 1.*I, 0., 0., 0., 0. + 1.*I, 0.,
> 0., -1., -1., -1., 4., 0., 0., -1.},
>   {0. + 1.*I, 0., 0., 0. + 1.*I, 0., 0., 0., 0. - 1.*I, 0. - 1.*I,  
> -1.,
> 0., 0., -1., 0., 0., 4., -1., -1.},
>   {0., 0. + 1.*I, 0., 0., 0. + 1.*I, 0., 0. - 1.*I, 0., 0. - 1.*I, 0.,
> -1., 0., 0., -1., 0., -1., 4., -1.},
>   {0., 0., 0. + 1.*I, 0., 0., 0. + 1.*I, 0. - 1.*I, 0. - 1.*I, 0., 0.,
> 0., -1., 0., 0., -1., -1., -1., 4.}}



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