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MathGroup Archive 2000

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Re: Speeding up Inverting matrices.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23048] Re: Speeding up Inverting matrices.
  • From: "Bill Bertram" <wkb at ansto.gov.au>
  • Date: Thu, 13 Apr 2000 02:43:32 -0400 (EDT)
  • Organization: Australian Nuclear Science and Technology Organisation
  • References: <8d0q3v$4oi@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

David McGloin wrote in message <8d0q3v$4oi at smc.vnet.net>...
>I wish to solve the matrix equation Ax = b for x where A is a 24 x 24
>matrix and x and b are column matrices. Most of the values in the matrix
>are numbers (and many are equal to zero), but one remains unevaluated
>i.e element [1,10] may be 160 + d, where d is unevaluated. Currently
>we're using the command:
>
>x = {Inverse [A]. b}
>


>
>Ultimately I want to extract arbitary elements of x and plot them
>against the unevaluated element.

Hi David,

 You could try  LinearSolve[A,b]  which is more efficient than the matrix
inversion method.

Cheers,

      Bill




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