Loads the listed packages only
Any additional R packages.
package1 and other packages listed in the arguments
maloneypatr, Irucka Embry
Check if R package is installed then load library answered by maloneypatr is the source for the original function. See https://stackoverflow.com/questions/15155814/check-if-r-package-is-installed-then-load-library.
Error Handling in R By Nina Zumel, October 9, 2012, R-Bloggers. See http://www.r-bloggers.com/error-handling-in-r/.
install_load if you are wanting to install and load packages
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