Transcription of R Reference Card
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R Reference Card
R Reference Cardby Tom Short, EPRI PEAC, 2004-11-07 Granted to the public domain. See for the source and latestversion. Includes material fromR for Beginnersby Emmanuel Paradis (withpermission).Getting helpMost R functions have online (topic)documentation ontopic? ("topic")search the help systemapropos("topic")the names of all objects in the search list matchingthe regular expression topic ()start the HTML version of helpstr(a)display the internal *str*ucture of an R objectsummary(a)gives a summary ofa, usually a statistical summary but it isgenericmeaning it has different operations for different classes ofals()show objects in the search path.
sample(x, size)resample randomly and without replacement sizeele-ments in the vector x, the option replace = TRUEallows to resample with replacement ... a matrix or a data frame, the variance-covariance matrix is calculated sd(x)standard deviation of x cor(x)correlation matrix of x if it is a matrix or a data frame (1 if x is a
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