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MathGroup Archive 2004

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Re: Slow LinearSolve.

  • To: mathgroup at
  • Subject: [mg49683] Re: Slow LinearSolve.
  • From: Bill Rowe <readnewsciv at>
  • Date: Tue, 27 Jul 2004 07:01:35 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

On 7/26/04 at 4:02 AM, aaronfude at (Aaron Fude) wrote:

>Within 24 hours and counting, Mathematica was not able to solve Ax
>= b for the following A and the following B. Another system does
>this in a matter of seconds. How do make Mathematica do the same? I
>use "LinearSolve[A, b]"

<snip definition of A and b>

Is the other system performing exact aritmetic? Do you really need an exact solution?


"5.0 for Mac OS X (June 10, 2003)"

Timing[Chop[LinearSolve[N[A], N[b]]]]

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