Hi,

I had a quick look at performances when working in R from rpy2.

The rpy2.robjects layer is predictably slower (hoewever a bit slower
than R than I wished), while the rpy2.rinterface lower-level interface
is faster.
Working with it is *faster than working from R* (about 7 times on the
simple/simplistic benchmark, and up to 14 times when using psyco).

There is a note about that in the doc for the dev version, but most of
it should apply to the released 2.0.x branch.
http://rpy.sourceforge.net/rpy2/doc-dev/html/performances.html#performances



L.




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