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From luc.maison...@free.fr
Subject Re: [math] autocorr
Date Mon, 27 Sep 2010 08:17:56 GMT

----- "Ted Dunning" <ted.dunning@gmail.com> a écrit :

> Everything in Colt was untested and as a result there were bugs and
> inconsistencies.
> 
> As part of the Mahout project, we have redefined the matrix primitives
> to be
> more amenable to our needs and simpler to extend than the original
> Colt
> arrays.  We have been busily either testing and converting code that
> we
> needed to build a scalable machine learning code and are
> simultaneously
> deleting pretty much everything that doesn't contribute to that goal.

I'm not sure anymore about which project the original question addressed.
Was it for Mahout or Commons-math ?

Luc

> 
> Some things are still around and some have already been deleted.  I
> believe
> that I was the one who recently deleted the Descriptive statistics
> back
> based largely on the fact that it wasn't very compatible with the rest
> of
> Colt (it uses DoubleArrayList instead of DoubleArray1D, for instance)
> and
> because most of the functions are relatively trivial.
> 
> Since autocorrelation depends on FFT's to compute and because it would
> be
> quite a bit of work to implement good tests FFT's, I
> think that is still the right decision for us to have made.
> 
> If you have a need for autocorrelation and would like to work with us
> to
> rehabilitate and port the associated Colt code, I would
> be happy to help by advising about our nascent conventions about how
> we are
> organizing our code and what sort of testing and
> porting is needed.
> 
> 
> On Sun, Sep 26, 2010 at 8:36 PM, video axescon <video@axescon.com>
> wrote:
> 
> > Hello
> >
> > I cant find autocorrelation function in stats package. Is there a
> reason
> > why
> > it wasn't implemented?
> > It exists in Colt project.
> >
> > cheers
> >

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