I am trying to create a simple dot-plot in ggplot2 with a solid line from the
y-axis to the dot, something I first saw in Cleveland's 1984 book
What I would like is to have the graph start at zero on the x-axis but leave
some space on the right side of the plot area.
I assumed that I should be able to do this with expand() in
scale_x_continuous() but either I'm wrong or just don't understand what
expand() is doing. So far, I see that scale_x_continuous(expand=c(0,0)) removes
the space on the right and left. but I don't understand how to just get the
left only to disappear.
Any help would be appreciated
Code below
#========================================
library(ggplot2)
xx<- structure(list(Food = c("Milk", "Bread", "Potatoes", "Rice"),
Expense = c(25L, 49L, 34L, 15L)), .Names = c("Food", "Expense"
), class = "data.frame", row.names = c(NA, -4L))
p <- ggplot(xx, aes(Expense, Food))
pa <- p + geom_point(aes(Expense, Food, colour=Food)) +
geom_segment(aes(x = 0, xend = Expense,
y = Food, yend = Food,colour=Food)) +
opts(legend.position = "none")
pa # so far so good
p1 <- pa + scale_x_continuous(expand=c(0,0))
#=======================================
R version 2.13.1 (2011-07-08)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=C LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] grid stats graphics grDevices utils datasets methods
[8] base
other attached packages:
[1] ggplot2_0.8.9 proto_0.3-9.2 reshape_0.8.4 plyr_1.7
John Kane
Kingston ON Canada
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