...
Thus don't assume packages are already installed:
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options(repos = "https://cloud.r-project.org") pkgs <- c("data.table", "dplyr", "ggplot2") for (pkg in pkgs) if (!length(find.package(pkg, quiet = TRUE))) install.packages(pkg, repos = "https://cloud.r-project.org") for (pkg in pkgs) library(data.table) library(dplyr) library(ggplot2pkg, character.only = TRUE) |