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 a

section called Student's Linear Equations. It is basically for didactic

purposes or solving small cases. It allows you to manipulate 2D matrix

structures with detailed operations such as individual operations on rows

and columns, individual column pivots, converting to echelon form with or

without upper triangular reduction. It also has display with row and column

names to give context. You can manipulate via successive displays in a

notebook, or in a Whiteboard window.

It also allows contravariant and covariant columns. There is also provision

for displaying rows or columns as equation expressions, both as regular

equations 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 literate

notebooks with custom graphics, tables and dynamic presentations.

David Park

djmpark@comcast.net

http://home.comcast.net/~djmpark/index.html

From: =A9er=FDch Jakub [mailto:Serych@panska.cz]

Dear comunity,

I'm trying to play around with the simple matrixes in Mathematica for the

first time and I have beginners question:

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.

I needed the step in the middle of the RowReduce way.

Thanks in advance for any tips

Jakub