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Re: LU factorization in Mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20658] Re: [mg20637] LU factorization in Mathematica
  • From: David Withoff <withoff at wolfram.com>
  • Date: Sun, 7 Nov 1999 02:09:59 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

> I apologise for this question but I did not find what iI was looking for
> on the Big Book.
> Any hint will be appreciated.
> 
> LUDecomposition returns a matrix that is a combination of the L and U
> matrices. But what kind of combination?
> How can I recover the two matrices L and U?
> What is the meaning of the pivoting vector (Does P[[k]]=j means that row
> k has been swapped with row j ?)
> 
> And what are the meaning of the elements returned by LUfactor (in the
> GaussianElimination package ), which returns a different pivot vector
> (and matrix as well)?
> 
> Thanks in advance,
> Peltio
> 
> peltio AT iname DOT com
> warning: Antispam return address <ON>

See

http://support.wolfram.com/Kernel/Symbols/System/LUDecomposition.html

Dave Withoff
Wolfram Research


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