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Scatter and Residual Plots 81
See the end of this section for more about linear fits, confidence bands, and polynomial
fitting, and the “Making Graphs” section for information about color schemes and a list
of point and line styles.
Figure 43.38: Output of the RESID2 program.
PlotPolyResid (x(), y(), n, ps, ls, col$)
Plot the residuals of y() against x(), where the residuals are computed against the
least-squares polynomial of degree n for the x/y data points. These arrays must have
the same bounds; if either coordinate in a point is missing, that point is ignored. If ps ≠
0, each point is drawn in that point style. If ls ≠ 0, the points are connected in order by a
line in that style.
By default, PlotResid automatically picks coordinates that show all the data. You can,
however, override its choices by using SetXrange and SetYrange.
The color scheme col$ is treated as usual. A string such as “red green yellow” gives a
red title, green frame, and yellow data.
Exception:
741 Polynomial degree must be positive integer in PlotPolyResid: n
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