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| ### Get a list of all your installed packages (so that you can reinstall them after updating R) | |
| a <- installed.packages() | |
| my_pkgs <- dimnames(a)[[1]] | |
| save(my_pkgs, file="my_pkgs.RData") | |
| # exit R, reopen R, then continue to following | |
| load("my_pkgs.RData") | |
| install.packages("a") | |
| missing_packages <- a[!a%in%installed.packages()] |
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