Putting arrows on the axes

The following style is popular in the classroom:

Notice that there is no border, but rather one pair of axes sporting arrows.

How to do it…

Execute the following script and you should see something very similar to the previous figure:

set arrow from graph 0,1 to graph 0,1.1 filled
set arrow from graph 1,0 to graph 1.1,0 filled
set tmargin 5
set rmargin 20
set border 3
set tics nomirror
set grid
plot sin(x)/x lw 2

How it works…

We learned about arrows in Chapter 2, Annotating with Labels and Legends. The first two lines define two arrows positioned using the graph coordinate system. This coordinate system is ideal for our purposes here, because 1 in this system is defined to be the very edge of the graph, which is exactly where we want the arrows to start. We also set them to be filled; as we saw in Chapter 2, Annotating with Labels and Legends, we can also, if we want, get very specific as to precisely how our little arrowheads are drawn. The set border 3 command tells...