ggplot2: example codes for matrix-like legend guide

example codes

p <- qplot(1:20, 1:20, col=letters[1:20])
p + guides(col=guide_legend(nrow=8))
p + guides(col=guide_legend(ncol=8))
p + guides(col=guide_legend(nrow=8, byrow=T))
p + guides(col=guide_legend(ncol=8, byrow=T))

# output plots: http://yfrog.com/klhjpwp
# how to embed images in gist...?

how to install dev version ggplot2

# you can install very very easily the develop version of ggplot2 on github thanks to Hadley's devtools package.

install.packages('devtools')
install.packages(c("RColorBrewer", "stringr", "dichromat", "munsell", "plyr", "colorspace")) # probably windows only

library(devtools)
dev_mode(TRUE)

install_github("scales")
install_github("ggplot2", "kohske", "feature/new-guides-with-gtable")

library(ggplot2)

@kohske