Nothing
install.tract<-function(x){
if(x=="osx" | x=="linux"){
utils::install.packages("UScensus2010tract", repos="http://R-Forge.R-project.org")
return()
}
if(x=="windows"){
rVer<-as.numeric(R.Version()$minor)
if(rVer>=11){
utils::install.packages("UScensus2010tract", repos="http://R-Forge.R-project.org")
return()
}else{stop("Not Available Yet")}
}
## Stop if x is misspecified
stop("x must equal linux, osx or windows")
}
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