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)

Hi Kohske,

I installed the developer version of ggplot2 with the following:

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

I did so because I need to avail myself of your guides() functions, which works as it should (thanks!)

I need, however, to use coord_cartesian(xlim(1,5)), but when I use this function with the developer version of ggplot2 as installed as you've instructed, I get the following error:

Error in coord$wise : object of type 'closure' is not subsettable

This error can be reproduced with the following code:

x1 <- c(1,1,1,3,3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5,6,6)
Dataset <- data.frame(x1)
ggplot(Dataset) + stat_density(aes(x = x1), geom = "path", position =
"identity") + coord_cartesian(xlim = c(1,5))

Any help would be appreciated! Thanks!

Hi,

Thanks for reporting the bug.

As for the bug, it has been fixed, but not yet merged into the "develop" branch.
Could you please try the "cutting-edge" branch?

install_github("ggplot2", "kohske", "cutting-edge")

This branch includes some bug fixes.
But please note that this is unofficial version, and hence I strongly recommend to use the official version on CRAN after it will be released.

Excellent. Thanks for the quick response.

The "cutting-edge" version seemed to fix the problem.

Two small(ish) problems with the ways the legend is now constructed with guides():

It seems that the legend labels are now centered rather than left-justified as they were before. I wonder if there is a parameter to put the labels back to left justification.

Also, when I set the legend.position to "bottom", the legend ends up in the bottom right hand corner of the plot window, rather than at the bottom and centered as it is in the official version.

My code is as follows:

ggplot(Dataset) +
my.theme(base_size = textsize) +
stat_density(aes(x = theAnswer, colour = theGroup, order = as.factor(theGroup)), size = 1, adjust = smooth, geom = "path", position = "identity") +
#facet_wrap(~question) +
coord_cartesian(xlim = c(0.5,5.5)) +
scale_x_continuous(breaks = c(1,2,3,4,5),
labels = answerLabels[(answer_5-4):(answer_5)]) +
scale_y_continuous(breaks = NA) +
labs(x = NULL, y = NULL, colour = "") +
opts(legend.position = "bottom",
legend.direction = "horizontal",
legend.key.size = unit((textsize/13), "lines"),
panel.background = theme_rect(fill = "grey14", colour = "grey14"),
plot.background = theme_rect(colour = "grey14"),
panel.border = theme_rect(fill = NA, colour = "grey90", size = 1.25),
plot.margin = unit(c(0, 7, 0, 5.5), "lines")) +
scale_colour_manual(breaks = legendOrder, values = color) +
guides(col=guide_legend(ncol=3))

Thanks again!

could you please provide a reproducible example?
?guide_legend will show you help page.

how can i set the legend row into one?

@kohske