[R] ggplot2 rose diagram
Tim Howard
tghoward at gw.dec.state.ny.us
Tue Mar 9 15:25:42 CET 2010
Dear R gurus -
consider this plot:
library(ggplot2)
dat <- sample(1:8,100,replace=TRUE)
smp <- ggplot(data.frame(dat), aes(x=factor(dat),fill=factor(dat))) + geom_bar(width=1)
smp + coord_polar()
Q1. How do I change the font size and weight of bar labels (1,2,3...)? I've been wallowing in the 'Themes' structure and I just can't figure out the correct place to change the definitions. Along these same lines, what does 'strip' mean when referring to strip text?
Q2. How can I move the legend defining bar height into the plot, so that it overlays the lines they refer to?
Consider the same figure using Circstats:
library(CircStats)
dat.rad <- (dat*((2*pi)/8)) -(2*pi)/16
rose.diag(dat.rad, bins = 8) #note the origin is to the right rather than on top
Q3. The key difference is that CircStats uses an area-based calculation for the size of each slice, which makes for a different presentation than ggplot2. Any suggestions on how to use this calculation method in the ggplot framework?
Thanks in advance for your help.
Tim Howard
New York Natural Heritage Program
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