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MathGroup Archive 1996

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Re: LinearSolve[] leads to core dump; why?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg5134] Re: [mg5009] LinearSolve[] leads to core dump; why?
  • From: Sherman Reed <Sherman.Reed at worldnet.att.net>
  • Date: Wed, 6 Nov 1996 01:32:52 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

At 06:25 AM 10/19/96 +0000, you wrote:
>
>wantec1.e-technik.tu-chemnitz.d-42 % more /tmp/lumpi
>m={{a[1, 1], a[1, 2], a[1, 3], 0, 0, 0, 0, 0},
>  {a[1, 2], a[2, 2], a[2, 3], a[2, 4], a[2, 5], 0, 0, 0},
>  {a[1, 3], a[2, 3], a[3, 3], a[3, 4], a[3, 5], 0, 0, 0},
>  {0, a[2, 4], a[3, 4], a[4, 4], a[4, 5], a[4, 6], a[4, 7], 0},
>  {0, a[2, 5], a[3, 5], a[4, 5], a[5, 5], a[5, 6], a[5, 7], 0},
>  {0, 0, 0, a[4, 6], a[5, 6], a[6, 6], a[6, 7], a[6, 8]},
>  {0, 0, 0, a[4, 7], a[5, 7], a[6, 7], a[7, 7], a[7, 8]},
>  {0, 0, 0, 0, 0, a[6, 8], a[7, 8], a[8, 8]}};
>r={{0}, {ki}, {0}, {0}, {0}, {0}, {0}, {0}};
>LinearSolve[m,r]
>
>
>$ math
>Mathematica 2.2 for DEC OSF/1 Alpha
>Copyright 1988-94 Wolfram Research, Inc.
> -- Terminal graphics initialized --
>
>In[1]:= <</tmp/lumpi
>
>Internal error: FreeExpr called on live expr.
>Abort - core dumped
>
>--
>Hans Friedrich Steffani
>Institut fuer Elektrische Maschinen und Antriebe, TU Chemnitz-Zwickau
>mailto:hans.steffani at e-technik.tu-chemnitz.de
>http://www.tu-chemnitz.de/~hfst/
>
>
Hans,

I ran your problem on a Win95 Pent 166, with 32 mb ram Mma 3.0.

It took 0.83 seconds using the Timing command.  The output file

was ~1.096 meg.

My guess is that you are running the kernel from the unix prompt. I am

not sure but I think you either exceeded your memory allocation or ran

out of memory.  Unix is a tough OS and running the kernel from the unix

prompt is also tough.

Sherman C. Reed



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