Re: [Rd] Lapack: SSYEV routine

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Tue, 07 Oct 2008 10:38:13 +0100 (BST)

On Tue, 7 Oct 2008, Nolwenn Le Meur wrote:

> Hi everyone,
>
> I am interested in using the SSYEV Lapack subroutine in a R package.
> Unfortunately I am not familiar with the all Lapack library and I was
> wondering why the routine SSYEV is not part of the R-LAPACK interface module.

Because it is a single-precision subroutine (that is what the leading 's' means), and R does not use single precision.

> Is there any plan to extend the R-Lapack module in the next R release?

No, because R does not use single precision.

> Should I try to directly call the SSYEV routine of the external Lapack
> library from my R package?

I think you should rethink why you are using single precision routines with R. If you need to, you need to ship the routines you need with the package, as e.g. fastICA does, for there need not be any 'external Lapack library'.

> Any help would be much appreciated.
>
> Best wishes,
> Nolwenn
>
> --
> Nolwenn Le Meur
> IRISA - Equipe Symbiose Campus de Beaulieu
> 35042 Rennes cedex - France
> Phone: +33 2 99 84 71 00
> Fax: +33 2 99 84 71 71
> E-mail: nlemeur_at_irisa.fr
> Web: http://www.irisa.fr/symbiose/web/nolwenn_le_meur
>
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>

-- 
Brian D. Ripley,                  ripley_at_stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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