[R] include C functions from nmath in my own C functions

[Prof Brian Ripley]

On Tue, 22 Feb 2005, yyan liu wrote:

> Hi:
>  I am writing a C program which need a gamma random
> number generator. I download the source file of R and
> compile, make it myself. There is a "rgamma.c"
> function in the installing directory of
> R("/home/zhliu/Backup/R-2.0.1/src/nmath/rgamma.c"). My
> question is how to call this function in my own
> program which is in another directory. I can not copy
> this "rgamma.c" to my working directory and use
> #inclucde"rgamma.c" because in the file "rgamma.c", it
> includes other header files. Or I can use makefile,
> but I do not know how to edit my makefile to do this
> job.

See src/nmath/standalone/README.

>  A related question is whether are similar .c files
> contains the matrix functions(product, invert) in the
> nmath library which I can use for my own C program?

No.  In general R uses LAPACK (or perhaps LINPACK) for such operations, 
and so can you.

The API for nmath is described in the `Writing R Extensions' manual.

-- 
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