Date: Jan 29, 2013 2:42 AM
Author: Daniel Lichtblau
Subject: Re: Matrix elimination

On Monday, January 28, 2013 1:24:26 AM UTC-6, =C5 er=C3=BDch Jakub wrote:
> Dear comunity,
>
> I'm trying to play around with the simple matrixes in Mathematica for the first time and I have beginners question:
>
>
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> Does Mathematica have a function, which makes the intermediate step of Gaussian elimination to produce just eliminated upper triangular matrix? Function UpperTriangular only cuts the lower triangular places off (which is not what I need) and RowReduce makes the completely reduced echelon form of matrix.
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> I needed the step in the middle of the RowReduce way.
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>
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> Thanks in advance for any tips
>
>
>
> Jakub


LUDecomposition will give, among other things, the upper triangular part. Note that it does pivoting so any usage of the result would need to take that into account.