Re: Documentation of Eigenvalues[], Eigensystem[]
- To: mathgroup at smc.vnet.net
- Subject: [mg114188] Re: Documentation of Eigenvalues[], Eigensystem[]
- From: Peter Pein <petsie at dordos.net>
- Date: Fri, 26 Nov 2010 05:30:17 -0500 (EST)
- References: <icdo32$68p$1@smc.vnet.net>
Am Mon, 22 Nov 2010 12:35:46 +0000 (UTC)
schrieb Murray Eisenberg <murray at math.umass.edu>:
> This is definitely a gap in the documentation.
>
> To find out that Eigenvalues has a Method option is easy, though:
>
> Options[Eigenvalues]
> {Cubics -> False, Method -> Automatic, Quartics -> False}
>
> What is difficult (impossible), however, is to find out for a Method
> option -- and a number of functions have it -- is what the possible
> settings are.
>
...
Eigenvalues[HilbertMatrix[4],Method->"foo"]
Eigenvalues::emeth: The method specified by Method -> foo should be
either Automatic, Arnoldi, or BandedMatrix.
works often, not always.