1. Descriptive Exploratory Data Analysis II
Jagdish S. Gangolly
State University of New York at Albany

2. Data Manipulation: Matrices: bind rows (rbind), bind columns (cbind)
Arrays: rowMeans, colMeans, rowSums, colSums, rowVars, colVars,…
apply(data, dim, function,…)
attach(framename):permits you to refer to variables without cumbersome notations. You can detach the frame when done.
function (x) { function definition}: To define your own functions
rm(comma-separated S-Plus objects): To remove objects

3. S-Plus Graphics
motif( ) : To open a graphics window. Each time you invoke this, a new graphics window is opened.
dev.off() : Close the most recent graphics device opened.
graphics.off() : Close all graphics devices.
plot(comma-separated variables, plot character)

4. Trellis Graphics I A matrix of graphs Example:
>par(mfrow=c(2,2)) # 2 X 2 matrix of figures
>x <- 1:100/100:1
>plot(x) # plot cell (1,1)
>plot(x, type=“l”) # plot cell (1,2) line
>hist(x) # plot cell (2,1) histogram
>boxplot(x) # plot cell (2,2) boxplot

5. Trellis Graphics II Syntax: >trellis.device(motif)
Dependent variable ~ explanatory variable |conditioning variable Data set
Output:
>trellis.device(motif)
>dev.off() or >graphics.off()