How to show all the labels in X-axis 45 degree in R 2x2 bar plot

Question

With the following data:

Method  Metric  E0  E1  E2  E4
Method-XXX  Precision   0.9661017   0.9622642   1   0.9655172
Method-YYY  Precision   0.533   0.535           


        

Answer 1

Here's a way to get all the labels without rotating. You plot the axis labels on two lines instead of one to avoid overlap. I've done it with a single graph to demonstrate the method.

dat <- read.table("http://dpaste.com/1563769/plain/",header=TRUE)

# Create barplot
barplot(height=dat$E0, beside=TRUE, col=c("red","blue"))

# Get x-coordinates of bars
x.coords = barplot(height=dat$E0, beside=TRUE, plot=FALSE)
# Create new coordinates between each pair of bars
new.x.coords = seq(sum(x.coords)[1:2]/2, sum(x.coords)[9:10]/2, x.coords[2]-x.coords[1])

# Plot axis labels, but not axis or tickmarks
axis(side=1, at=new.x.coords[c(1,3,5)], labels=dat$Method[c(1,3,5)], line=0, tick=FALSE)
axis(side=1, at=new.x.coords[c(2,4)], labels=dat$Method[c(2,4)], line=1, tick=FALSE)
# Plot just axis and tickmarks, but not labels
axis(side=1, at=new.x.coords, labels=NA)