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MathGroup Archive 1996

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RE Looking for Gaussian Elimination Code

  • To: mathgroup at smc.vnet.net
  • Subject: [mg3862] RE [mg3783] Looking for Gaussian Elimination Code
  • From: MATHEWS at ccvax.fullerton.edu
  • Date: Sat, 4 May 1996 02:13:45 -0400
  • Sender: owner-wri-mathgroup at wolfram.com


In [mg3783], Nicholas Fogelson, University of Oregon wrote:

Does anyone have Mathematica code that does a Gaussian Elimination on an
input matrix?  I realize that this is built into Mathematica but I really
need to be sure that the code is of complexity O(n^3) and I'm not sure
that the Mathematica implementation doesn't do some optimization that 
I don't want.
Thanks



REPLY


    Look in the complementary software supplements for:
Numerical Methods for Mathematics, Science & Engineering, 2nd Ed
by  John H. Mathews  published by  Prentice Hall, 1992
ISBN# 0-13-624990-6  and  ISBN# 0-13-625047-5

    NUMERICAL METHODS: Mathematica Notebooks

These files are located at the Wolfram Research, Inc. ftp site

ftp://ftp.wri.com/MathSource/Publications/BookSupplements/Mathews-1995/0207-874
or
http://www.wri.com/MathSource/Publications/BookSupplements/Mathews-1995/0207-874


Algorithm 3.2 (Upper-Triangularization Followed by Back Sub.)
To construct the solution to  AX = B, by first reducing the augmented
matrix [A,B] to upper triangular form and then performing back
substitution.
Section	3.4   Gaussian Elimination and Pivoting   Page  156


Best Regards,

John Mathews
Dept. of Mathematics
California State University Fullerton
Fullerton, CA 92634   USA
E-mail:    mathews at fullerton.edu




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