[R] how to statically load a lib *.a

[Prof Brian D Ripley]

On Mon, 10 Jan 2000, Tony Q. Zhang wrote:

> Hi, 
> 
>    I built a PORT library (libport.a) from NetLib, which contains lots of
> Fortran subroutins. How can I statically load it into R? Or should I
> recompile R with this library?

You just need to dyn.load the code, which means you need to build a shared
library (libport.so).  You could add it by re-compiling, but this should
not be necessary, and you would need to declare the entry points
in src/appl/ROUTINES.

> btw, all I'm trying to do is to port _constrained_ optimization routine
> 'nlregb' into R. It is based on the public routines from netlib. I don't
> know exactly how difficult (or easy) it is. 

It's not at all easy, as you need to pass around and evaluate R expressions
in (in your case) Fortran code and that will require C glue layers.  There
is a function optim() in the development version of R (the basis for the
next release) which has a box-constrained optimizer like nlminb: that might
do what you want.  Alternatively, read the nlm interface code and see if
you really want to do this!

-- 
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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