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Re: Issues with eigs

From: Thomas D. Dean
Subject: Re: Issues with eigs
Date: Sun, 9 Sep 2018 16:25:44 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 09/09/18 14:01, Dmitri A. Sergatskov wrote:
I have lapack 3.8.0 and I also see fluctuations in eigs output.
It looks to me some variable (initial guess?) is not defined and it
is picking up some junk.

I think you are correct.

n = size(m1,1)
eigs(m1, m0, struct("v0", zeros(n,1), "p", n))

Seems to always return the same value.  Maybe incorrect value???

Octave, Scipy, and Maple2018 all do not agree!  Even to 1 digit!

I know this problem is difficult to solve, as are many real world problems. But, ...

Tom Dean

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