Elegant way to check for missing packages and install them?

Question

How can I check for missing packages and call for installed.packages() to install them smartly?

Answer 1

Yes, you can easily check your package in R programming. If you are having your list of packages, compare it to the output from installed.packages()[,"Package"] and install the missing packages.

list.of.packages <- c("ggplot2", "Rcpp")

new.packages <- list.of.packages[!(list.of.packages %in% installed.packages()[,"Package"])]

if(length(new.packages)) install.packages(new.packages)