rotate X axis labels 45 degrees on grouped bar plot R

Question

How can I rotate the X axis labels 45 degrees on a grouped bar plot in R?

I have tried the solution suggested here but got something very messy, the labels seem to h

Answer 1

Try the first answer:

x <- barplot(table(mtcars$cyl), xaxt="n")
labs <- paste(names(table(mtcars$cyl)), "cylinders")
text(cex=1, x=x-.25, y=-1.25, labs, xpd=TRUE, srt=45)

But change cex=1 to cex=.8 or .6 in the text() function:

text(cex=.6, x=x-.25, y=-1.25, labs, xpd=TRUE, srt=45)

In the picture you posted, it appears to me that the labels are just too big. cex sets the size of these labels.