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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.


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