Install and load missing specified/needed packages on the fly

[This article was first published on R by Emmanuel Jjunju, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)
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This is a short script to help installing packages on the fly.It is most useful if you are distributing a set of script files to people who may not be aware that the needed packages are not installed on their systems. It is also useful if you use many packages and want to organise their installation (if missing) and/or loading at the beginning of a script.
Enjoy:

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