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