r-forge

I recently installed R-2.12.0 from R-2.11.1 and I've updated all CRAN packages via: update.packages(checkBuilt=TRUE, ask=FALSE) Now I want to update all the packages I have installed from R-forge, but only if they're not available on CRAN . In other words, I cannot simply run: update.packages(checkBuilt=TRUE, ask=FALSE, repos="http://r-forge.r-project.org") because it would install the R-forge version of the survival package over the version that came with R-2.12.0. I could probably use some combination of the information from old.packages and packageStatus to determine which packages exist

I develop a package in R and when I check and build it in my local computer it works properly. But when I tried it in CRAN, I get a package dependencies error. My package depends on two functions of other packages. If I list the other packages under the description using Depends or imports , will it be automatically installed with the new package? Or do I need to explicitly invoke the function install.packages("packagename") under the function that I've used the other packages. if this all is wrong, what is the best way to solve package dependencies in R inorder to pass the R CMD check and