Modern R Programming Cookbook

Getting ready

In R, generally if you write the object name into the console, then it automatically prints its internal elements. For example, take a look at the following code snippet:

    x <- c(13, 21, 19, 18, 21, 16, 21, 24, 17, 18, 12, 18, 29, 17, 18,       11, 13, 20, 25, 18, 15, 19, 21, 21, 7, 12, 23, 31, 16, 19, 23, 15,    25, 19, 15, 25, 25, 16, 29, 15, 26, 29, 23, 24, 20, 19, 14, 27, 22,    26)    class(x) <- "robustSummary"

Now, if you just type x in the R console, it will print all the items in the object x and its class name. In R, when you call an object into the R console, it actually looks for a method for the class of the given object. If there is no method available for that class, then it automatically calls print.default() and produces ...