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GNU/Linux Desktop Survival Guide
by Graham Williams 		Google

Getting Started With R

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Emacs, provided by the emacs21 package, with the additional ess package, provides an excellent interface for working with R. To get started within emacs, simply issue the command M-x R $<$enter$>$. This will ask for a starting data directory which defaults to the current working directory (if you simply press $<$enter$>$ again).

Then try a few simple commands like the following (from the sample session appendix of the Venables and Smith Introduction to R: 



  R : Copyright 2004, The R Foundation for Statistical Computing
  Version 1.9.1  (2004-06-21), ISBN 3-900051-00-3
  [...]
  > help.start()
  > x <- rnorm(50)
  > y <- rnorm(x)
  > x
  > y
  > plot(x,y)
  > ls()
  > x <- 1:20
  > w <- 1 + sqrt(x)
  > q()

Some tips and tricks: 

  > ?plot                       # The ? is a shortcut for help().

  > ds[,5:10]                   # Select columns 5 to 10 from ds.
  > ds[,c(3,5,8,9)]             # Select columns 3, 5, 8, and 9 from ds.

  > class(x)                    # Identify the type of x.
  > identical(x,y)              # Test if data is identical.
  > nrow(ds)                    # Number of rows in the data set.
  > rm(list=ls(all=TRUE))       # Remove everything from the environment.
  > sample(2:12, 100, replace=TRUE) # 100 random samples with replacement.
  > summary(dataset)            # Generates a summary of the dataset.


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