[R] installing packages from a directory on the computer

From: Subramanian S <subbu_at_sssu.edu.in>
Date: Tue, 22 Jun 2010 11:09:33 +0530

i wish to know how to set a folder in computer as a mirror from which i can install packages
i am aware of the menu approach- "Packages>install from local zip files" but i wish to know the command line approach because i dont have internet access
on the computer where i will be using R.

i have put the zip files of packages in
C:\R\packages\bin\windows\contrib\2.11

i have put the following lines in Rprofile.site

 local({r <- getOption("repos")

       r["CRAN"] <- "file://C:/R/packages/"
       options(repos=r)})

but when i run install.packages("package_name_here"), i get the following message:

Warning in gzfile(file, "r") :
  cannot open compressed file
'//C:/R/packages/bin/windows/contrib/2.11/PACKAGES', probable reason 'No such file or directory'
Error in gzfile(file, "r") : cannot open the connection

Please help

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