ggplot2 (version 0.9.1)

ggpcp: Make a parallel coordinates plot.

Description

One way to think about a parallel coordinates plot, is as plotting the data after it has been transformed to gain a new variable. This function does this using melt.

Usage

ggpcp(data, vars = names(data), ...)

Arguments

data

data frame

vars

variables to include in parallel coordinates plot

...

other arguments passed on plot creation

Details

This gives us enormous flexibility as we have separated out the type of drawing (lines by tradition) and can now use any of the existing geom functions. In particular this makes it very easy to create parallel boxplots, as shown in the example.

Examples

ggpcp(mtcars) + geom_line()
ggpcp(mtcars, vars=names(mtcars[2:6])) + geom_line()
ggpcp(mtcars) + geom_boxplot(aes(group=variable))

p <- ggpcp(mtcars, vars=names(mtcars[2:6]))
p + geom_line()
p + geom_line(aes(colour=mpg))