ROOT R:

[omazapa]

Hi Axel and Lorenzo,

I take the code and I put it in one commit to let review it easy.
In resume the changes are
-> Now you can use R functions in C++ very easy using the class TRFunctionImport, that have overloaded operators to use objects like functions that receives template arguments and return TRObjects.
-> Documentation updated in http://oproject.org/tiki-index.php?page=ROOT+R+Users+Guide#Import
-> added documentation in doxygen
-> new propieties for TRDataFrame with operators

You can see the output of documentation in
http://files.oproject.org/root/rootdoc/html/group___r.html
users guide in markdown integrate to doxygen
http://files.oproject.org/root/rootdoc/html/md__home_omazapa_root_bindings_r_doc_users-guide__r_o_o_t_r__users__guide.html

I have the code now in https://github.com/oprojects/root

Best Regards
O.