Barplot with Categorical X Axis

I am trying to generate a bar plot with a categorical X axis and two different y axis. I am trying to use twoord.plot to generate the bar plot as follows:

x <- c("A","B","C","D","E")
ry <- c(0.1,0.2,0.3,0.4,0.5)
ly <- c(0.15,0.25,0.35,0.45,0.55)

However, I am getting an error "Error in plot.window(...) : invalid 'xlim' value".

Is there a way to work with categorical/character variables as x-axis? Also, is there a way to rotate the X-axis labels so that they show up at 45 degrees?

I have been able to get this code to work with the following changes:

xNumeric <- seq(1:length(x))
              type=c("bar","o"),lcol=rainbow(length(x)),rcol = 4,xticklab = x)

However, I still need to figure out how to rotate the X-axis labels as well as adding a legend to differentiate between which is the box plot and which is the line plot. Any help on this would be appreciated

Thank you.


This isn't in plotrix, but...

ry <- c(0.1,0.2,0.3,0.4,0.5)
ly <- c(15,35,65,75,80)
x <- 1:5
xlabs <- c("A","B","C","D","E")
barplot(ly, xaxt="n", yaxt="n", xlab="xLabel", ylab="lyLabel", ylim=c(0,100))
axis(2, seq(0,100,by=5), seq(0,100,by=5), las=2) # you can adjust positions of ly labels
plot(ry~x, xaxt="n", yaxt="n", xlab="", ylab="", ylim=c(0,1))
axis(1, 1:5, xlabs)
axis(4, 1:10/10, 1:10/10, las=2) # you can adjust positions of ry labels
mtext("ryLabel", 4, line=2)

And you would obviously need to edit a bit to get the colors, etc. that you seem to be going for.

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