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How can I install a package that is under development directly from a github repository and once installed how can I switch between development and CRAN versions?

The specific package I am interested in installing from git is ggplot2.

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To install the development version of R packages from the github repository, you can use the devtools package.

For example:

install.packages("devtools")

library(devtools)

dev_mode(on=T)

install_github("hadley/ggplot2")

# use dev ggplot2 now

# when finished do:

dev_mode(on=F)  #and you are back to having stable ggplot2

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