[R] Preventing repeated package installation, or pre installing packages

Michael Dewey lists at dewey.myzen.co.uk
Wed Nov 29 17:05:48 CET 2017

Dear Larry

As far as your first question is concerned I think one of require or 
requireNamespace may be what you need.


On 29/11/2017 14:28, Larry Martell wrote:
> I have a R script that I call from python using rpy2. It uses dplyr, doBy,
> and ggplot2. The script has install.packages commands for these 3 packages.
> Even thought the packages are already installed it still downloads,
> builds, and installs them, which is very time consuming. Is there a way to
> have it only do the install if the package is not already installed?
> Also, I run in a docker container, so after the container is instantiated
> the packages are not there the first time the script runs. Is there a way
> to pre load the packages, in which case I would not need the
> install.packages commands for these packages and my above question would
> become moot.
> 	[[alternative HTML version deleted]]
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