Question

I want to plot several lists of points, each list has distance (decimal) and error_no (1-8). So far I am using the following:

plot(b1$dist1, b1$e1, col="blue",type="p", pch=20, cex=.5)
points(b1$dist2, b1$e2, col="blue", pch=22)

to add them both to the same plot. (I will add legends, etc later on).

The problem I have is that points overlap, and even when changing the character using for plotting, it covers up previous points. Since I am planning on plotting a lot more than just 2 this will be a big problem.

I found some ways in:

http://www.rensenieuwenhuis.nl/r-sessions-13-overlapping-data-points/

But I would rather do something that would space the points along the y axis, one way would be to add .1, then .2, and so on, but I was wondering if there was any package to do that for me.

Cheers
M
ps: if I missed something, please let me know.

Answer 1

As noted in the very first point in the link you posted, jitter will slightly move all your points. If you just want to move the points on the y-axis:

plot(b1$dist1, b1$e1, col="blue",type="p", pch=20, cex=.5)
points(b1$dist2, jitter(b1$e2), col="blue", pch=22)