Re: Issues with eigs

[Juan Pablo Carbajal]

Hi,

I can't reproduce in 4.4.0, which Octave version are you using? What OS?

> eigs(m1,m0)
ans =

         0.00032 - 2672312.38464i
         0.00032 + 2672312.38464i
         0.00004 - 2639857.10699i
         0.00004 + 2639857.10699i
         0.00010 + 2587664.34543i
         0.00010 - 2587664.34543i

> version
ans = 4.4.0
> which eigs
'eigs' is a function from the file /usr/local/share/octave/4.4.0/m/sparse/eigs.m

On Fri, Sep 7, 2018 at 3:02 PM Manav Bhatia <address@hidden> wrote:
>
> Hi,
>
>    I have a set of matrices, M0 and M1 (attached), obtained from numerical 
> discretization of a beam problem.
>
>    I am attempting to solve the eigenproblem    M1 x = lambda M0 x .
>
>    Computing this with the following works fine:
> >  m0 = load(‘M0.txt’); m1 = load(‘M1.txt’);
> >  eig( m1, m0)
>
>
>     However, using eigs( m1, m0) throws the following error:
> error: __eigs__: eigs: error -8 in dnaupd
> error: called from
>     eigs at line 285 column 18
>
>     I am not sure what could be causing this. Any guidance will be 
> appreciated.
>
> Thanks,
> Manav
>
>