Web Application Development with R Using Shiny - Second Edition

The R console

Windows and Mac OS X users can run the R application to launch the R console. Linux and Mac OS X users can also run the R console straight from the terminal by typing R.

In either case, the R console itself will look something like this:

R will respond to your commands right from the terminal. Let's have a go:

> 2 + 2
[1] 4

The [1] tells you that R returned one result, in this case, 4. The following command shows how to print Hello world:

> print("Hello world!")
[1] "Hello world!"

The following command shows the multiples of pi:

> 1:10 * pi
[1]  3.141593  6.283185  9.424778 12.566371 15.707963 18.849556
[7] 21.991149 25.132741 28.274334 ...