R Draw All Axis Labels (Prevent Some From Being Skipped)

Question

When I manually add the following labels with (axis(1, at=1:27, labels=labs[0:27])):

> labs[0:27]
 [1] \"0\\n9.3%\"  \"1\\n7.6%\"  \"2\\n5.6%         


        

Answer 1

?axis tells you that:

The code tries hard not to draw overlapping tick labels, and so will omit labels where they would abut or overlap previously drawn labels. This can result in, for example, every other tick being labelled. (The ticks are drawn left to right or bottom to top, and space at least the size of an ‘m’ is left between labels.)

Play with cex.axis so that labels are small enough to fit without overlapping

labs <-c("0\n9.3%","1\n7.6%","2\n5.6%","3\n5.1%","4\n5.7%","5\n6.5%","6\n7.3%",
         "7\n7.6%","8\n7.5%","9\n7%", "10\n6.2%","11\n5.2%","12\n4.2%",12:27)
plot(1:27,xaxt = "n")
axis(side=1, at=1:27, labels=labs[0:27],cex.axis=0.35)

If you widen you graph (manually by dragging or programmatically), you can increase the size of your labels.