Re: Solving a very strange minimization problem with Octave

[Topi, Corrado]

Dear Jaroslav,

I apologize. The expression should read:

min || D_ij - SUM p | SUM k A_pk Q_pkij| || (1)

Regards

Jaroslav Hajek wrote:
> On Thu, Sep 17, 2009 at 6:11 PM, Topi, Corrado <address@hidden> wrote:
> > Dear Octave-ians,
> >
> > I have to solve the following problem:
> >
> > min || D_ij - SUM p | SUM k A_pk Q_ij| || (1)
>
> given that Q_ij is not dependent on p,k, it is, using your notation,
> SUM p | SUM k A_pk Q_ij| = |Q_ij| SUM p | SUM k A_pk| = |Q_ij| * C and
> you need to minimize || D_ij - C*|Q_ij|||, i.e. a 2-norm of a linear
> combination of two given matrices?
>
> If not, please clarify your expression.

--
Corrado Topi

Area 18,Department of Biology
University of York, York, YO10 5YW, UK
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