Question

I have a problem in plotting uneven scale plot on x axis with R

Here is an example:

plot(1:100,1:100)

will give the equal tick space on x axis.

However, I want to show the graph with first half of space showing 1 to 10, and the left half space showing 10 to 100, so the points in the 10 to 100 more dense, and points in 1:10 are easier to see. How to do it with R?

Like this:

Answer 1

This is not an easy one-off task to complete. You’ll actually need to transform to the scaled data and supply custom tick marked axes. Any reason you haven’t considered simply logging the x-axis instead? (supplying the option plot(x, y, log='x') will do that).

What I think you’ve described is this:

xnew <- ifelse(x<10, x, x/10)
plot(xnew, y, axes=FALSE, xlab='x')
axis(1, at=c(0, 10, 20), labels=c(0, 10, 100))
axis(2)
box()