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A very short introduction to R Pia Wohland

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R is… -A statistical software -Programming language -Free! -Very good in handling and manipulating data sets -very comprehensive, easy to learn -large community, with many contributors -well supported mailing list -additinal packages written by users -Works with command line but some graphical user interfaces (GUI) available: R-Commander, Rpad, SciViews-R Info on R http://www.r-project.org/ Download software http://cran.r-project.org/

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http://addictedtor.free.fr/graphiques/ Graphics Maps Create your own functions See an example in the Practical this afternoon! Statistics Manage your data

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R under windows > Command prompt

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You can type your commands directly at the command prompt (>) or you can use the Editor window. The advantage of the editor is, you can save your script straight away.

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> help() # opens help > help.start() # opens R-Documentation in a browser window > help(command) # shows help on “command” > ?command # shows help on “command” > library() # Shows which packages are loaded? > library(help="graphics") # Shows help for package “graphics” For example > ?plot Help youRself....

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Package the command belongs to How to use What arguments, and their default settings

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Always examples at the bottom Links to related subject

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Essentials: R is case sensitive! (beware auto correction) Decimal separator `.´ not`,´ Character strings are placed in “ “ Where are my data? To find out in which directory R is working: getwd() To change the directory: setwd(“pathname”) Caution: setwd(“C:\\SummerSchoolPracticals“) setwd(“C:/SummerSchoolPracticals“) When importing your own data: best no spaces in header. 2.718282,71828

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