numeric.eig

[franco....@gmail.com]

C = [[1,0,0,0],[0,0,0,0],[0,0,0,1],[0,0,1,0]];

d = numeric.det(C);
OUT > 0

v = numeric.eig(C).lambda.x;
// transcript from workshop
OUT > Error: eig: internal error house@http://www.numericjs.com/lib/numeric-1.2.6.js:1361 @http://www.numericjs.com/lib/numeric-1.2.6.js:1462 @http://www.numericjs.com/lib/numeric-1.2.6.js:1402 eig@http://www.numericjs.com/lib/numeric-1.2.6.js:1480 @http://www.numericjs.com/myworker.js:34 @http://www.numericjs.com/myworker.js:34

Is this a bug? It is not so difficult to calculate the eigenvalues of  C. I don't understand what is the problem here. Anyway, numericjs is a nice library, thank you for your work!

Francesco Acanfora

[Sébastien Loisel]

Hi Francesco,

Thanks for your email. This is a known bug that occurs e.g. when the
eigenvalues are repeated. I'm very sorry I never got around to fixing
it! My job and my newborn meant that the difficulty in doing a whole
regression suite test and deploying safely (which would take me about
a week), has been beyond my available time. Sorry! :(

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--
Sébastien Loisel
Assistant Professor
Department of Mathematics, Heriot-Watt University
Riccarton, EH14 4AS, United Kingdom
web: http://www.ma.hw.ac.uk/~loisel/
email: S.Loisel at hw.ac.uk
phone: +44 131 451 3234
fax: +44 131 451 3249