thesteady / test-r

calling R from a Rails app

== README for Test-R ==

This app is to test out running an Rscript from a Rails rake task. Check out the rake task run_r_script for more.

Random Notes:

Getting R on your Machine

  brew tap homebrew/science
  brew install r

Installing packages for R on your machine

You might need a package to do some complicated maths. To install it on your server, run

R

to open the R CLI, then

install.packages(<packagename>)

where packagename is a string. You'll then need to select a mirror to download from, choose one closest to you. To see which packages are installed, type installed.packages(). Before you can use a package, you have to load it into your workspace. To do this, type library(<packagename>). Curious which packages you have loaded and ready to be used? Type search() to list them.

About R commandArgs:

https://stat.ethz.ch/R-manual/R-devel/library/base/html/commandArgs.html

setting for only returning trailing arguments, after --args

About 'stringr'

In this exercise, we'll use the stringr library to show how to load and use an R package. Stringr documentation

stringr provides a pattern-matching method, str_detect to determine whether or not a provided string matches a provided pattern.

To install it, refer to the instructions on installing an R package, above.