Initialize an R session.

0 if the initialization was successful.

The following example initializes R with default options:

 initok:=Rinit
 if initok<>0 then writeln('Failed to initialize R')
 end-if

The use of this function is optional: R is automatically initialized upon first use. Default R startup options are "--slave", "--vanilla", so no site or user environment, profile, history and workspace files are processed. Please refer to the R documentation for the exact meaning of these and other options ( http://cran.r-project.org/doc/manuals/r-release/R-intro.html#Invoking-R).

Rfree.