Now we will create a graph with two curves and three axes. First, let's read the following vectors of data:
x <- c(-25:25) y <- 1.5*x + 2 z <- 0.3*(x**2) - 20
In the preceding code, we have a linear function and a quadratic function. As you will see, we will need some extra room for text on the right-hand margin. This is because we wish to add some explanatory text there. By default, graphs in R have margins that are as follows:
We want to create a right-hand margin 8.1-lines wide on the right axis using the
mar argument, which controls margin widths:
par(mar=c(5, 4, 4, 8) + 0.1)
Note the ...