```Date: Jan 29, 2013 2:42 AM
Author: David Park
Subject: Re: Matrix elimination

The Presentations Application (which I sell from my web site for \$50) has asection called Student's Linear Equations. It is basically for didacticpurposes or solving small cases. It allows you to manipulate 2D matrixstructures with detailed operations such as individual operations on rowsand columns, individual column pivots, converting to echelon form with orwithout upper triangular reduction. It also has display with row and columnnames to give context. You can manipulate via successive displays in anotebook, or in a Whiteboard window.It also allows contravariant and covariant columns. There is also provisionfor displaying rows or columns as equation expressions, both as regularequations and as chemical composition equations or as chemical reactions.There is also provision for doing linear programming simplex operations.Presentations is a quite large Application aimed toward writing literatenotebooks with custom graphics, tables and dynamic presentations.David Parkdjmpark@comcast.nethttp://home.comcast.net/~djmpark/index.htmlFrom: =A9er=FDch Jakub [mailto:Serych@panska.cz]Dear comunity,I'm trying to play around with the simple matrixes in Mathematica for thefirst time and I have beginners question:Does Mathematica have a function, which makes the intermediate step ofGaussian elimination to produce just eliminated upper triangular matrix?Function UpperTriangular only cuts the lower triangular places off (which isnot what I need) and RowReduce makes the completely reduced echelon form ofmatrix.I needed the step in the middle of the RowReduce way.Thanks in advance for any tipsJakub
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