Hi Barton,
Thank you for the workaround.. it works great.
Best regards,
bowo
On 03/04/07, Barton Willis <willisb at unk.edu> wrote:
> A workaround for this case (but not a good solution in general)
>
> (%i1) m : rationalize(matrix( [10.48273938962865,14.15187882832064],
> [21.22781824248096,31.71055763210962]))$
>
> float(eigenvectors(m));
> (%o2)
> [[[0.77255988699335,41.42073713474491],[1.0,1.0]],[1.0,-0.68614066163451],[1.0,
>
> 2.186140661634508]]
>
>
> Barton
>
> -----maxima-bounces at math.utexas.edu wrote: -----
>
> >To: maxima at math.utexas.edu
> >From: "Bowo Prasetyo"
> >Sent by: maxima-bounces at math.utexas.edu
> >Date: 04/03/2007 06:44AM
> >Subject: 'eigenvectors' failed..
> >
> >Hi,
> >
> >'eigenvectors' failed to work on numeric 2x2 matrix below..
> >
> >m: matrix( [10.48273938962865,14.15187882832064],
> >[21.22781824248096,31.71055763210962] );
> >eigenvectors(m)
> >
> >It gave the following error message..
> >
> >algsys failure: the eigenvector(s) for the 1 th eigenvalue will be
> >missing.
> >algsys failure: the eigenvector(s) for the 2 th eigenvalue will be
> >missing.
> >
> >and just returned the eigenvalues..
> >
> >[0.77255984019432, 41.42073711336268]
> >
> >Using another software.. the eigenvectors should be..
> >
> >eigenvector of eigenvalue 0.7725598869933528:
> > (-0.8245648401323937, 0.5657674649689922)
> >eigenvector of eigenvalue 41.42073713474491:
> > (0.4159735579192842, 0.9093767091321241)
> >
> >Anyone knows what has happened?
> >
> >I noticed little difference in eigenvalues after 7-8th decimal place
> >between Maxima and that another software.. maybe this caused the
> >failure?
> >
> >Best regards,
> >bowo
> >_______________________________________________
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> >Maxima at math.utexas.edu
> >http://www.math.utexas.edu/mailman/listinfo/maxima
>
>