[Rd] calling fortran functions CHOL and DPOTRF form Fortran

[Douglas Bates]

On 7/5/05, Gilles GUILLOT <gilles.guillot at inapg.inra.fr> wrote:
> Hi all,
> 
> I'm working out some Fortran code for which
> I want to compute the Choleski decomposition of a covariance matrix
> in Fortran.
> 
> I tried to do it by two methods :
> 
> 1) Calling the lapack function DPOTRF.
> I can see the source code and check that my call is correct,
> but it does not compile with:
> system("R CMD SHLIB ~/main.f")
> dyn.load("~/main.so")
> 
> I get:
> Error in dyn.load(x, as.logical(local), as.logical(now)) :
>         unable to load shared library
> [...]
>  undefined symbol: dpotrf_
> 
> Could anyone point out how to compile with such a call to lapack?

Make a small package from your source code then follow the instructions in

http://tolstoy.newcastle.edu.au/R/devel/05/06/1382.html

> 
> 2) Calling the Fortran function CHOL
> The previous combination of R CMD SHLIB  and dyn.load
> compiles fine but  I would like to see the source code of this function
> to check if my call is correct. I've not been able to find it in  the R source
> distribution.
> Could anyone point the place of that file?

${RSRC}/src/appl/chol.f

> 
> Thanks in advance,
> 
> Gilles
> 
> 
> --
> _________________________________________________________________________
> Gilles GUILLOT
> 
> INRA -Département Mathématiques et Informatique Appliquées
> Unité Mixte de Recherche INRA - INAPG - ENGREF
> 
> Institut National Agronomique de Paris-Grignon
> 16, rue Claude Bernard
> 75231 Paris cedex 5 France
> 
> phone 33 1 44 08 18 42
> fax   33 1 44 08 16 66
> http://www.inapg.fr/ens_rech/mathinfo/personnel/guillot/welcome.html
> 
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