[SciPy-user] solve for symetric matrix ?
fred
fredmfp@gmail....
Thu Apr 26 05:52:42 CDT 2007
Ronan Perrussel a écrit :
> fred a écrit :
>> But in fact, he was confused. They are negative definite (kriging
>> matrices).
>> Bad news :-(
> Then you can solve with -A instead of A?
I tried it, of course ;-)
But cho_factor() rejects -A too.
One of the definition of the positive definite (if I understand right)
is that the eigenvalues must be positive.
So in my case, as A has negative egv, -A has positive ones.
Although -A has positive ones, cho_factor() raise error.
--
http://scipy.org/FredericPetit
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