The following code provides a simple example of how to produce a plot using R (see Figure 1.1).

> plot(pressure) > text(150, 600,

"Pressure (mm Hg)\nversus\nTemperature (Celsius)")

The expression plot(pressure) produces a scatterplot of pressure versus temperature, including axes, labels, and a bounding rectangle.∗ The call to the text() function adds the label at the data location (150, 600) within the plot.