A student wanted a reference card, so I made the following.
Someone might want to fix it up, adapt it, make it into a
screen saver, demolish it, or whatever. I will surely do
some of those. My version will remain in
http://www.psych.upenn.edu/~baron/refcard.pdf
Here is the Latex text. The package "hanging.sty" probably
will have to come from CTAN.
Jon
----------
\documentclass[twocolumn]{article}
\usepackage{mathpple}
\usepackage{hanging}
\oddsidemargin=0in \evensidemargin=0in \topmargin=-.3in
\textwidth=6.5in \textheight=9in
\pagestyle{empty}
\setcounter{secnumdepth}{0}
\parskip=0ex \parindent=0pt
\begin{document}
\noindent
\textbf{R reference card,} by Jonathan Baron
\medskip
\textbf{Miscellaneous}
\smallskip
{\tt q()}: quit
{\tt <-}: assign
{\tt INSTALL}: install packages
{\tt m[,2]}: column 2 of matrix {\tt m}
{\tt m\$a}: variable {\tt a} in data frame {\tt m}
{\tt NA}: missing data
{\tt is.na}: true if data missing
{\tt library(ctest)}: load (e.g.) ctest library
\medskip
\textbf{Help}
\smallskip
{\tt help.start()}: start browser help
{\tt help(command)}: get help with command
{\tt library(help=ctest)}: help with library
{\tt apropos("topic")}: relevant commands
{\tt example(command)}: examples
\medskip
\textbf{Input and output}
\smallskip
{\tt source("file")}: run the commands in {\tt file}.
{\tt read.table("file")}: read in data from a file
{\tt data.entry}: spreadsheet
{\tt scan(x)}: read a vector x
\smallskip
{\tt download.file}: from internet
{\tt url.show, read.table.url}: remote input
\smallskip
{\tt sink("file")}: output to {\tt file}, until {\tt sink()}
{\tt write(object, "file")}: writes an object to file
{\tt write.table(object,"file")}: writes a table
\medskip
\textbf{Managing variables and objects}
\smallskip
{\tt attach(x)}: put variables in {\tt x} in search path
{\tt detach(x)}: remove from search path
{\tt ls()}: lists all the active objects.
{\tt rm(object)}: removes objects
{\tt dim(matrix)}: dimensions of a matrix
{\tt dimnames(x)}: names of dimensions
{\tt length(vector)}: length of a vector
{\tt 1:3}: is the vector {\tt 1,2,3}
{\tt rep(x,n)}: repeats the vector {\tt x n} times
{\tt c(1,2,3)}: creates the same vector
\hangpara{2em}{1}{\tt cbind(a,b,c), rbind()}: binds columns or
rows into a matrix
{\tt merge}: merge data frames
{\tt matrix(numbers,rows,colmuns)}: creates a matrix
{\tt data.frame(vector list)}: makes a data frame
\hangpara{2em}{1}{\tt as.factor(), as.matrix(), as.vector()}: conversion
\hangpara{2em}{1}{\tt is.factor(), is.matrix(), is.vector()}: what it is
{\tt t()}: switch rows and columns
{\tt which(x==a)}: returns indices of {\tt x} where x==a
\medskip
\textbf{Control flow}
\smallskip
{\tt for (i in vector)}: repeat what follows
\medskip
\textbf{Arithmetic}
\smallskip
{\tt \%*\%}: matrix multiplication
\medskip
\textbf{Statistics}
\smallskip
\hangpara{2em}{1}{\tt max(), min(), mean(), median(), sum()}, var(): as named
{\tt summary(data.frame)}: prints statistics
{\tt rank, sort} rank and sort
\smallskip
{\tt ave(x,y)}: averages of {\tt x} grouped by factor {\tt y}
{\tt by}: apply function to data frame by factor
\hangpara{2em}{1}{\tt apply(x,n,function)}: apply function to x
by rows (n=1) or colums (n=2)
\hangpara{2em}{1}{\tt tapply(x,list,function)}: apply function to x by list
{\tt table}: make a table
{\tt tabulate}: tabulate a vector
\medskip
\textbf{basic statistical analysis}
\smallskip
{\tt aov, anova, lm, glm}: linear models and anova
{\tt t.test()}: t test
\medskip
\textbf{tests in ctest library}
\smallskip
{\tt prop.test(), binom.test()}: sign test
{\tt chisq.test(x)}: chi-square test on matrix {\tt x}
{\tt fisher.test()}: Fisher exact test
{\tt cor(a)}: show correlations
{\tt cor.test(a,b)}: test correlation
{\tt friedman.test}: Friedman test
\medskip
\textbf{tests in mva library}
\smallskip
{\tt print(prcomp(x))}: principal components
{\tt kmeans()}: kmeans cluster analysis
\medskip
\textbf{Graphics}
\smallskip
{\tt plot(), barplot(), boxplot()}: basic plots
{\tt matplot()}: matrix plot
{\tt pairs(matrix)}: scatterplots
{\tt hist(x)}: histogram of vector {\tt x}.
{\tt coplot}: conditional plot
{\tt stropplot}: strip plot
{\tt qqplot}: quantile-quantile plot
\end{document}
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
