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Re: octave eigs function

From: Poulette Poulette
Subject: Re: octave eigs function
Date: Wed, 22 May 2013 15:25:44 +0100 (BST)

I installed the octave-devel +atlas+docs through macports (I already have Xcode, Xquartz, etc...).

"port installed" gives : arpack @3.1.2_1+accelerate+gcc47+openmpi (active)
Thus I suppose Arpack to be installed...


De : Jordi Gutiérrez Hermoso <address@hidden>
À : Poulette Poulette <address@hidden>
Cc : help octave <address@hidden>
Envoyé le : Mercredi 22 mai 2013 16h01
Objet : Re: octave eigs function

On 22 May 2013 08:06, Poulette Poulette <address@hidden> wrote:
> I have Octave version 3.6.4 for mac (osX 10.8.3).

How did you install it, Mme Poulette?

> I don't know how to use/obtain eigs function to calculate eigen vectors and
> eigenvalues.

You only need eigs if you're working with sparse matrices or if you
only want a few eigenvalues of your matrix. Otherwise you can use eig.

> The error is : "eigs: not available in this version of Octave"

However you obtained Octave, it looks like you compiled it without
ARPACK. You need to recompile Octave with ARPACK support.

- Jordi G. H.

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