By Mike Allerhand (auth.)
This short offers a roadmap for the R language and programming atmosphere with signposts to additional assets and documentation.
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Additional info for A Tiny Handbook of R
4 Saving Graphics Graphics functions produce displays by sending instructions to a ‘‘graphics device’’. The default device is the monitor screen, but other graphics devices27 include PDF files and image files in various formats including jpeg and bmp. Each device has ‘‘driver’’ software that translates the device-independent plotting instructions sent by the graphics function into device-specific plotting instructions. Each device has a function to ‘‘open’’ it, (making its driver software available for use).
The size, shape, and colour can be set using arguments cex (‘‘character expansion’’), pch (‘‘plot character’’), and col (‘‘colour’’). These parameters take vector values which are recycled to match the number of points plotted in order to control each plotted point individually. The first element in the vector controls the first plotted point, the second controls the second point, and so on. 14 Labels can be suppressed by passing the empty string xlab="", ylab="", and drawn subsequently using title.
6 The table function creates a frequency table from one or more factors given as arguments. 7 [ tableðx$HairÞ [ tableðx$Hair; x$EyeÞ [ tableðx$Hair; x$Eye; x$SexÞ # Count of each Hair colour # Cross-tab of Hair by Eye # Cross-tab of Hair by Eye by Sex The table labels can be set or changed using dimnames: [ tab¼tableðx$Hair; x$EyeÞ # 2-D table [ dimnamesðtabÞ # Get the dimnames [ # Set dnn ðdimnames namesÞ only: [ [ [ [ [ 5 namesðdimnamesðtabÞÞ¼cð"Hair colour"; "Eye colour"Þ # Set dimnames only: dimnamesðtabÞ¼listðcð"A"; "B"; "C"; "D"Þ; cð"E"; "F"; "G"; "H"ÞÞ # Set both dnn and dimnames: dimnamesðtabÞ¼listðhair¼cð"A"; "B"; "C"; "D"Þ; eye¼cð"E"; "F"; "G"; "H"ÞÞ xtabs uses a formula argument to specify which variable in the data frame contains the frequencies, and which variables are the grouping factors.
A Tiny Handbook of R by Mike Allerhand (auth.)