R help - Feb 2011 - Modifying a package name / Build from sources (rpart)

Dear List Members



Upfront: I am not sure if this is the right place to ask this question even
after reading through the FAQ, so apologies if I should have directed the
question elsewhere.

My problem as follows: I need a modified version of some existing R package.
I am well able to make the modifications in the C code of the package and
can build it by R CMD. However, I would like to install and load the package
differently, i.e., instead of library(packageorig) I would like to load it
by library(packagemod) such that the functions names provided by the package
remain identical but the library / packagename is different.


More specifically, I need a different cross-validtion scheme in the package
rpart.


Which parts of the sources do I need to adapt? Can you point me to
some resources where this kind of questions is answered?



Kind regards and many thanks in advance,


Simon

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Simon Knos <simon_mailing <at> quantentunnel.de> writes:
> Upfront: I am not sure if this is the right place to ask this question even
> after reading through the FAQ, so apologies if I should have directed the
> question elsewhere.
  I appreciate your confusion.  I think this might be slightly more
appropriate for r-devel, but it's a judgment call.
> My problem as follows: I need a modified version of some existing R
package.
> I am well able to make the modifications in the C code of the package and
> can build it by R CMD. However, I would like to install and load the
package
> differently, i.e., instead of library(packageorig) I would like to load it
> by library(packagemod) such that the functions names provided by the
package
> remain identical but the library / packagename is different.
> 
> More specifically, I need a different cross-validtion scheme in the package
> rpart.
> 
> Which parts of the sources do I need to adapt? Can you point me to
> some resources where this kind of questions is answered?
  I think that if you simply modify the "Package:" entry in the
DESCRIPTION file that will do the trick.  It might be a good idea
to modify the version/author/maintainer lines as well to avoid future
confusion.

  See the R "Installation and Administration" manual.

  Ben Bolker