Dear R-users,
Can some one help me out. I tried installing some packages in R_2.5.1 but I
get an error message as shown below. This is unusual since I have been
installing and updatings packages in the same version of R.
> chooseCRANmirror()
> update.packages(ask='graphics')
Error in .readRDS(pfile) : unknown input format
or
> utils:::menuInstallPkgs()
Error in .readRDS(pfile) : unknown input format
Thanks
usman
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