[R] Announce: R from Python

Walter Moreira walterm at cmat.edu.uy
Thu Mar 7 21:53:26 CET 2002

On Fri, Mar 08, 2002 at 07:24:27AM +1100, Tim Churches wrote:
> I can see your server now but Duncan Temple Lang was kind enough to send
> me a copy of RPy in the meantime. He commented that he thought that R
> objects in RPy aren't being protected from garbage collection but that
> was easy to fix. 

Yes, Duncan is probably right, I don't fully understand the R api wrt garbage
collection. Could you or Duncan send me some indications about where it is
needed the protection from gc? Thank you.

> >>> from rpy import *
> gives
> Traceback (most recent call last):
>   File "rpy_test.py", line 1, in ?
>     from rpy import *
>   File "/usr/local/lib/python2.1/site-packages/rpy.py", line 23, in ?
>     from _rpy import *  # If this fails, you need to compile the C
> extension
> ImportError: libR.so: cannot open shared object file: No such file or
> directory
> Hmmm. libR.so exists in /usr/lib/R/bin, which is in my path. 
> If I issue
> ld _rpymodule.so 
> then ld complains it can't find libR.so
> ld -rpath /usr/lib/R/bin _rpymodule.so
> fixes this error. But how to I tell _rpymodule.so where to look for
> libR.so

Perhaps you need to run ldconfig after the installation to rearrange the libraries. Then you can try

  ldd _rpymodule.so

to see if all libraries were found. I think they should.


Walter Moreira   <>  Centro de Matematica  <>  Universidad de la Republica
email: walterm at cmat.edu.uy  <>  Home Page: http://www.cmat.edu.uy/~walterm
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