test.txt

Example data-exploring session, Tue 7 Jul 2009

Experimental peak-finding session, Wed 8 Jul 2009

Example R code for using a legend in a plot

Example R code for placing labels directly in a plot

Miscellaneous tricks

Fitting and Regression

Working with factors

Getting nice log scales on plots

R has a vast collection of functions. This is an attempt to organize them into functional categories:

Random number distributions and sampling

Character String operations

File I/O

Formatting output

File I/O: reading in complex timestamp records and creating a data frame

Spherical Trig: Which way is Pittsburgh?

hist.log10.R | Semi-log10 histogram plot |

plotxyerr.R | X-Y plot with error bars |

cartesian.R | cartesian product of two vectors |

least_squares_linear.R | linear least squares fit, performed without using R's built-in regression routines |

str2log10.R | Convert Blast output e-val strings to numeric log10 values |

R Wiki R documentation contributed by the user community

Rseek.org

Quick-R

Graphical Parameters

Cluster Analysis

NY Times story, 6 Jan 2009

Dice.com piece about R being important for analytical careers