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misalignment of x-axis when overlaying two plots using latticeExtra
2 messages · Sean Zhang, Felix Andrews
Hi Sean,
as.layer() does not do what you think it does: it does not attempt to
plot things on a common scale, it simply draws the panels of two
lattice plots in the same space. Actually, it is not very useful on
its own.
What you want is doubleYScale() in the development version (0.5-5) of
latticeExtra. You can install it with
install.packages("latticeExtra", repos="http://R-Forge.R-project.org")
then
doubleYScale(barchart.obj, dot.outcome)
By the way, wise persons say plotting on multiple scales is often a
bad idea. I would at least make sure both axes start from zero.
-Felix
2009/1/15 Sean Zhang <seanecon at gmail.com>:
Dear R-helpers:
I am an entry-level R user and have a question related to overlaying a
barchart and and a xyplot using latticeExtra.
My problem is that when I overlay them I fail to align their x-axes.
I show my problem below through an example.
#the example data frame is provided below
vec <-c(1,5.056656,0.5977967,0.06126587,0.08557778,
2,4.601049,0.5995989,0.05002188,0.11410027,
3,4.932008,0.5502283,0.06727938,0.12531825,
4,4.763798,0.5499489,0.06473846,0.10752641,
5,4.944967,0.5328129,0.05445327,0.13663951,
6,5.063504,0.5267245,0.06477738,0.12380332,
7,4.735251,0.5528205,0.06851714,0.12196075,
8,5.141733,0.5304151,0.07965567,0.15123277,
9,5.215678,0.5219224,0.06694207,0.16476356,
10,4.930439,0.5712519,0.08591549,0.09710933,
11,5.075990,0.5615573,0.05778996,0.15361845,
12,4.909847,0.5683740,0.08711699,0.11189277,
13,4.863164,0.5652511,0.07222227,0.12071060,
14,5.173818,0.5564918,0.09830620,0.11831926,
15,4.762325,0.5345888,0.08792658,0.11738642,
16,5.046225,0.5268459,0.09574746,0.13254236,
17,4.902188,0.5370394,0.07194955,0.13164327,
18,4.865935,0.5446562,0.06894994,0.12645103,
19,5.204060,0.5650887,0.06726925,0.09242551,
20,5.208138,0.5765187,0.09282935,0.11053842)
df<-as.data.frame( t(matrix(vec,nrow=5,ncol=20)))
names(df)<-c("group","outcome","proportion_1","proportion_2","proportion_3")
library(latticeExtra)
library(lattice)
#First generate barchart to plot the 3 proportions
prop.data <-subset(df,select=c(proportion_1,proportion_2,proportion_3))
prop.tab <- as.table(as.matrix(prop.data))
barchart.obj<-barchart(prop.tab, stack=TRUE, horizontal = FALSE)
#Second, generate the dots of outcome (I could have used type="l" but using
type="p" makes the
#misalignment of x-axis more obvious.
dot.outcome <- xyplot(outcome~group,df,type="p", col="blue")
#Last, overlay the two plots
barchart.obj+ as.layer(dot.outcome,style=2,axes=c("y"), outside=TRUE)
#Now, you should be able to see the x-axis of the two plots are not
matching.
#i.e., a dot is not at the center of its correspoding bar.
How can I fix this?
Your help will be highly appreciated. Many thanks in advance.
-Sean
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