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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SinkðÞ # . ftable for flat tables created by ftable. 11 9 Function abind is in package abind, and is designed to combine arrays. If arrays are combined using c it strips the dim and dimnames attributes which are required by ftable. txt file opens in Notepad. csv file opens in MS Excel. 11 See: help(Sweave). 2 Graphs The original R graphics package is referred to as ‘‘base graphics’’. Other graphics packages include lattice and ggplot2. 1 Base Graphics The concept of the base graphics functions is for successive functions to add graphics and build plots up.
2 Graphs 55 limited range of plot styles specified by letters,23 for example "p" for points, and "r" for a regression line: [ xyplotðSepal:Length $Petal:Length j Species; data¼iris; type¼cð'p'; 'r'ÞÞ [ xyplotðSepal:Length $Petal:Length; groups¼Species; data¼iris; type¼cð'p'; 'r'ÞÞ For example a trellis plot of growth-curve data: [ dataðsleepstudy; package¼"lme4"Þ [ xyplotðReaction $Days j Subject; data¼sleepstudy; type¼'b'Þ [ xyplotðReaction $Days j Subject; data¼sleepstudy; type¼cð'p'; 'r'ÞÞ The panel argument allows you to pass a panel function to specify exactly how to plot each panel.
Matrix and data frame cells have pairs of indices, respectively for rows and columns, as in: x[i,j]. Arrays have tuples of indices depending on the dimensionality of the array, as in: x[i,j,k] 30 2 Data Structures (for a 3-dimensional array). An empty index is shorthand for a complete index. For example: [ swiss½cð10; 15Þ; 2:3 [ swiss½cð10; 15Þ; [ swiss½; 2:3 # Index rows 10 and 15; and columns 2 to 3 # Rows 10; 15 and all columns ðempty column indexÞ # Columns 2:3 and all rows ðempty row indexÞ If the object has named parts an index vector can be character or numeric: [ swiss½cð10; 15Þ; cð"Agriculture"; "Examination"Þ # Same as: swiss½cð10; 15Þ; 2:3 A single index to a data frame accesses columns by number or by name.
A Tiny Handbook of R by Mike Allerhand (auth.)