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Re: Re: Diagonalize sparse matrix and documentation in

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92259] Re: [mg92257] Re: Diagonalize sparse matrix and documentation in
  • From: Thibaut Jonckheere <Thibaut.Jonckheere at cpt.univ-mrs.fr>
  • Date: Thu, 25 Sep 2008 05:30:22 -0400 (EDT)
  • References: <gbake6$12a$1@smc.vnet.net> <200809240733.DAA13746@smc.vnet.net>

Jens-Peer Kuska wrote:
> you
> "However, I found no mention of these options in the documentation "
> ???
>
> Hmm .. Open the Help-Notebook for Eigensystem[] amd look into the
> "Possible Issues" section and ... what is the last example ??
>
> {vals, vecs} = Eigensystem[s, 3, Method -> {"Arnoldi", Shift -> -4}];
>
>   

Tha'ts true, but Arnoldi is simply mentionned, without any explanation. 
And more importantly, there is no mention of the essential options, like 
'Criteria' or 'MaxIterations' in the Eigensystem[] help page.

Regards,

Thibaut Jonckheere


> And if you type in
>
> Eigensystem[{{1, 0}, {0, 1}}, Method -> "foo"]
>
> what does Mathematica say
>
> Eigensystem::emeth: "The method specified by Method -> "foo"
> should be either Automatic or Arnoldi. "
>
> Regards
>    Jens
>
>   
>>
>>
>>
>>     
>
>
>   


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