[R] Neophyte question re using dyn.load and accessing c functions

[Barnet Wagman]

I'm have what's probably a trivial &| silly problem trying to access a
c-function in a shared
library ( R 0.64, under redhat linux 5.2).

    R COMPILE rctest.c
    R SHLIB -o libRC.so rctest.o

produce a reasonable looking shared library ('nm libRC.so' shows that
the function 'rctest' is present).

In R, the command

    dyn.load("/fullpathname/libRC.so")

returns without an error.  However, I'm unable to access the function.
E.g.

    is.loaded(symbol.C("rctest"))

yields FALSE.

    .C("rctest",x)

yields "Error in .C("rctest", x) : C/Fortran function not in load table"

There must be something I'm leaving out, but after searching the
documentation and
help archive, I'm stuck.  Does the .so have to be in an R package (if
so, where)?

Thanks,

-------------------
Barnet Wagman

wagman at enteract.com
773-645-8369

1361 N. Hoyne
Chicago, IL 60622
--------------------


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