GuruGram #109 newly available for free download

Aug 30, 2010 2 Replies
D

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It is on avoiding blowups when doing Gauss Jordan solution of linear nxn equations.



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Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU's LAIR web site at http://www.tinaja.com
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T

Easy.

Open MATLAB, or if you prefer, GNU Octave,

block = [data]; y = rref(block);

For e.g. a 3x3 inhomogeneous system Ax = b, specify block = [A1, A2, A3, b1; ...], a 4x3 matrix. Result (if nonsingular) is the identify matrix with the rightmost column equal to the result (i.e., x1 + 0 + 0 = y1, ...).

Tim

Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
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D

And the results for a 65x65 set of linear equations are... ?

Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU's LAIR web site at http://www.tinaja.com
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