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I have an R script that is shared with several users on different computers. One of its lines contains the install.packages("xtable") command.
The problem is that every time someone runs the script, R spends a great deal of time apparently reinstalling the package (it actually does take some time, since the real case has vector of several packages).
How can I make first check if the packages are installed and then only run install.packages() for the ones that are not?
try:
require("xtable")or"xtable" %in% rownames(installed.packages())try
if(!require("xtable")) install.packages("xtable")