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2009 Apr 26
1
Problem installing packages
since 2.9.0 version I have a problem with installing packages: install.packages("sp") --- Please select a CRAN mirror for use in this session --- Loading Tcl/Tk interface ... done Warning: unable to access index for repository http://piotrkosoft.net/pub/mirrors/CRAN/src/contrib Warning messages: 1: In open.connection(con, "r") : unable to resolve '' 2: In