If you look at the help for install.packages:
help(install.packages)
You will see that the first argument to install.packages takes a vector of
the package names. In your case, you are passing three arguments to the
function, so R is trying to install "RExcelInstaller" package into a library
directory called "rcom" which is what is causing the error as there is no
"rcom" library directory.
You could install the packages like this:
install.packages(c("RExcelInstaller","rcom","rscproxy")) #note that its
'rscproxy' not 'rsproxy'
In the above R code you can see how only one argument is provided to
install.packages: a length 3 character vector of the package names.
However, I would recommend installing RExcel via the R and Friends installer
distributed by statconn. You can find it here:
http://rcom.univie.ac.at/download.html Using the installer ensures that the
registry and system path variables are set up correctly.
Also, note that rcom has its own (private) mailing list to which you should
direct your RExcel related questions. You can sign up for the mailing list
here: https://lists.univie.ac.at/mailman/listinfo/rcom-l
Good luck.
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