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Sometimes on Stack Overflow, there's a question relative to a package which is not installed on my system, and which I don't plan to reuse later.
If I install the package with install.packages(), it will be put in one of my R install libraries, and then will take some storage space and be updated each time I run update.packages().
Is there a way to install a package only for the current R session ?
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You only need to install packages the first time you use R (or after updating to a new version). **R Tip:** You can just type this into the command line of R to install each package. Once a package is installed, you don't have to install it again while using the version of R!
packages()[, "Package"]) { stop("Package Deriv not installed successfully.") }
It shouldn't be an issue unless you install a package as an admin user, and again as a normal user. Then you will have a version in two different locations on your system. That could lead to issues when upgrading, or confusion as to which version is loaded.
You can install a package temporarily with the following function :
tmp.install.packages <- function(pack, dependencies=TRUE, ...) { path <- tempdir() ## Add 'path' to .libPaths, and be sure that it is not ## at the first position, otherwise any other package during ## this session would be installed into 'path' firstpath <- .libPaths()[1] .libPaths(c(firstpath, path)) install.packages(pack, dependencies=dependencies, lib=path, ...) } Which you can use simply this way :
tmp.install.packages("pkgname") The package is installed in a temporary directory, and its files should be deleted at next system restart (at least on linux systems).
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