Quickly Exploring Data - R Graphics - page 10

See Also
See Chapter 5 for more in-depth information about creating scatter plots.
Creating a Line Graph
Problem
You want to create a line graph.
Solution
To make a line graph using plot() ( Figure 2-3 , left), pass it a vector of xvalues and a vector of
yvalues, and use type="l" :
plot(pressure$temperature, pressure$pressure, type="l") = "l" )
Figure 2-3. Left: line graph with base graphics; right: with points and another line
To add points and/or multiple lines ( Figure 2-3 , right), first call plot() for the first line, then
add points with points() and additional lines with lines() :
plot(pressure$temperature, pressure$pressure, type="l") = "l" )
points(pressure$temperature, pressure$pressure)