[CSC 335] Row reductions in Octave...

[Andrew J. Pounds]

Okay -- I promised to send along some help on how to do row operations 
in Octave.  Fortunately this has been a problem many folks have tackled 
before, so let me ask you to start by downloading three Octave functions 
written by Dr. Doug Rall at Furman.

elemrow1.m <http://math.furman.edu/%7Edrall/mth160/elemrow1.m>
elemrow2.m <http://math.furman.edu/%7Edrall/mth160/elemrow2.m>
elemrow3.m <http://math.furman.edu/%7Edrall/mth160/elemrow3.m>

Save these in the directory where you will run Octave.  To see how to 
use them type "help elemrow1" in Octave.  Below I will use the third 
operation to row reduce the linear system via Gaussian Elimination (the 
example I worked in class last Thursday)

octave:2> A = [2,1,3,1;4,4,7,1;2,5,9,3]
A =

    2   1   3   1
    4   4   7   1
    2   5   9   3

octave:3> A = elemrow3(A,1,2,-2)
A =

    2   1   3   1
    0   2   1  -1
    2   5   9   3

octave:4> A = elemrow3(A,1,3,-1)
A =

    2   1   3   1
    0   2   1  -1
    0   4   6   2

octave:5> A = elemrow3(A,2,3,-2)
A =

    2   1   3   1
    0   2   1  -1
    0   0   4   4


-- 
Andrew J. Pounds, Ph.D.  (pounds at theochem.mercer.edu)
Associate Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627

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