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From Andrew Musselman <andrew.mussel...@gmail.com>
Subject Re: matrix inversion in plan ?
Date Thu, 08 Oct 2015 21:52:52 GMT
Yeah, nice trick Ted; here's a how-to for the list:
http://www.cse.unr.edu/~bebis/CS791E/Notes/SVD.pdf

On Thu, Oct 8, 2015 at 2:31 PM, Ted Dunning <ted.dunning@gmail.com> wrote:

> Yes. You can get the inverse from an SVD or emulate its effect.
>
> Can you share the actual mathematical specification for your problem?
>
> If you can't, then there is little we can do to help.
>
>
>
> On Wed, Oct 7, 2015 at 11:35 PM, go canal <gocanal@yahoo.com.invalid>
> wrote:
>
> > Unfortunately I do not know much details of these. The steps of these
> > calculation is passed to me from a research team. I am helping them with
> > coding part only. I myself is not good at math :-(
> > btw,  I think Mahout supports out-of-core SVD, am I correct ? If so, I
> can
> > get inverse of matrix from SVD right ? thanks, canal
> >
> >
> >      On Monday, October 5, 2015 2:25 PM, Ted Dunning <
> > ted.dunning@gmail.com> wrote:
> >
> >
> >  That isn't enough detail.
> >
> > How do you mean to compute degrees of freedom?  WHy do you need the
> inverse
> > to do this?
> >
> > Where did you get this algorithm?
> >
> > Is this even appropriate at large scale?
> >
> > Is this a stable computation?
> >
> >
> >
> > On Sun, Oct 4, 2015 at 11:18 PM, go canal <gocanal@yahoo.com.invalid>
> > wrote:
> >
> > > I will be more than interested to extend to complex double, when the
> > > solver is ready for double data type.  thanks, canal
> > >
> > >
> > >      On Monday, October 5, 2015 2:02 PM, Ted Dunning <
> > > ted.dunning@gmail.com> wrote:
> > >
> > >
> > >  On Sun, Oct 4, 2015 at 10:32 PM, go canal <gocanal@yahoo.com.invalid>
> > > wrote:
> > >
> > > > in fact i need to support both double and complex double for either
> > > > distributed memory based or out-of-core.
> > >
> > >
> > > Ahh...
> > >
> > > Well Mahout doesn't support complex anything. So this isn't going to
> help
> > > you.
> > >
> > >
> > >
> >
> >
> >
>

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