[Numpy-discussion] roots and high-order polynomial

Fabrice Silva silva@lma.cnrs-mrs...
Fri Jul 3 07:26:39 CDT 2009


Le vendredi 03 juillet 2009 à 11:52 +0200, Nils Wagner a écrit :
> You will need multiprecision arithmetic in that case.
> It's an ill-conditioned problem.

I may have said that the solution are of the same order of magnitude, so
that the ratio between the lowest and the highest absolute values of the
eigenvalues are rather close to one.
Does it help ?

Looking in the debian repository, I found python-gmpy, an interface GMP
to Python. But how could it be used to compute the eigenvalues of the
companion matrix ? I will look in the doc...

-- 
Fabrice Silva <silva@lma.cnrs-mrs.fr>
LMA UPR CNRS 7051



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