Re: [Chicken-users] atlas-lapack egg release 1.0

[Kon Lovett]

On Mar 15, 2007, at 5:42 PM, Pierre-Alexandre Fournier wrote:

> Hi,
>
> I installed the atlas-lapack egg, thanks again Ivan for this great
> contribution. Here are some comments I have after testing it today:
>
> 1- You need eggdoc to install atlas-lapack, should this be resolved by
> chicken-setup?

Yes. Add it to the needs list in the atlas-lapack egg .meta.

> 2- Some or all functions are mutating vectors. In the example in the
> documentation, after evaluating the solver for A * X = B:
>
> (atlas-lapack:dgesv order n nrhs a b)
>
> vector a contains the L and U matrixes, and b contains the N-by-NRHS
> solution matrix X. Should the fact that mutations occur be in the
> documentation? Do you think these functions should be marked with "!"
> following the Scheme convention?

Maybe. In the above case the bang would be in-order but this api  
follows the C api.

Appending the bang might not be a good idea. I mean, this is  
basically the C api, with SRFI-4 vector conversion & Scheme error  
notification.

> 3- If vectors a and b contains the solution to the equation, maybe you
> could return only the pivot indices so we don't have to use let-values
> to use the results. (How do you use let-values with chicken?)

(define (foov a b) (values a b))
(define (barv a b) (values a b))

(let-values (([a b] (foov 1 2)) ([c d] (barv 1 2)))
  (print a #\space b #\space c #\space d) )

> I'll keep on testing it and give you more comments later.
>
> Cheers,
>
> Pierre-Alexandre

Thank you,
Kon

> 2007/3/12, felix winkelmann <address@hidden>:
> > On 3/11/07, Ivan Raikov <address@hidden> wrote:
> > >
> > > Hi all,
> > >
> > >     I have created Chicken Scheme bindings for the ATLAS-LAPACK
> > > library. The ATLAS project (Automatically Tuned Linear Algebra
> > > Software) is an effort to implement linear algebra routines that  
> > are
> > > optimized to take advantage of SIMD architectures such as SSE and
> > > AltiVec, and it includes portable optimized implementations of all
> > > routines in the BLAS library, and of a small subset of the LAPACK
> > > library.
> > >
> > >     The atlas-lapack egg provides an interface to those LAPACK
> > > routines that have been implemented by the ATLAS project. It is
> > > available in the eggs SVN repository
> > > <https://galinha.ucpel.tche.br/svn/chicken-eggs/atlas-lapack/>.
> > > Could someone upload the egg to the web page, please?
> > >
> > > Also, in the next few days I will probably create bindings for some
> > > more matrix factorization routines in LAPACK, and hopefully  
> > eventually
> > > there will be a lapack egg (or eggs) to provide bindings for the
> > > entire library.
> >
> > Egg is uploaded. Thanks, Ivan!
> >
> >
> > cheers,
> > felix
> >
> >
> > _______________________________________________
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> > http://lists.nongnu.org/mailman/listinfo/chicken-users
>
>
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