add text to horizontal barplot in R, y-axis at different scale?
I'm trying to add some text to the right hand side of a horizontal barplot at the same heights as each bar, however, both text() and axis() don't seem to plot this at the heights corresponding to each bar.
Here's a similar barplot
x <- runif(10, 0,1)
y <- matrix(c(x, 1-x), nrow=2, ncol=10, byrow=TRUE)
barplot(y, horiz=TRUE, beside=FALSE, names.arg=seq(1,10,1), las=1, xlim=c(0, 1.2))
Neither of these two options align properly, how does the scaling work here?
axis(4, at=seq(1,10,1), labels=seq(1,10,1))
text(1.1, seq(1,10,1), labels=seq(1, 10, 1))
Solution 1:
By chacking the documentation of barplot
, you can see that it has an invisible return value: the midpoints of the bars. You can use those to add additional information to the plot.
x <- runif(10, 0,1)
y <- matrix(c(x, 1-x), nrow=2, ncol=10, byrow=TRUE)
bp <- barplot(y, horiz=TRUE, beside=FALSE, names.arg=seq(1,10,1), las=1,
xlim=c(0, 1.2))
text(x, bp, signif(x,2), pos=4)
bp