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8 Statistics Graphics Toolkit
Finally, PlotScat draws the scatter plot. Each point is marked in point style 10 (solid
block). Line style 0 means that connecting lines between the points are omitted. And
finally, PlotScat also gives the color scheme.
Multiple Scatter Plots
It’s equally easy to plot several datasets on the same graph. Call up SCATMANY from
your disk, and run it.
Figure 43.04: Output of the SCATMANY program.
This program plots the number of home runs hit by the leading batters in the National
and American baseball leagues between 1920 and 1940. A rather interesting pattern
emerges.
SCATMANY is much like SCAT except that the x() and y() arrays are two dimensional
so they can hold information about multiple datasets. In addition, the program defines
a legend$() array that holds the legends for the two datasets: “National League” and
“American League.”
PlotManyScat draws all the datasets, picking nice colors and point styles for each set.
As always, you should be wary of blithely fitting least-squares lines to data! Compare
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