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• Press L to recover the menu. Press L@)PICT to recover the original
graphics menu.
• When we observed the graph being plotted, you'll notice that the graph
is not very smooth. That is because the plotter is using a time step that is
too large. To refine the graph and make it smoother, use a step of 0.1.
Try the following keystrokes: @CANCL ˜˜˜.1@@@OK@@@ @ERASE @DRAW.
The plot will take longer to be completed, but the shape is definitely
smoother than before.
• Press @EDIT L @LABEL @MENU, to see axes labels and range. Notice that
the labels for the axes are shown as 0 (horizontal) and 1 (vertical). These
are the definitions for the axes as given in the PLOT WINDOW screen
(see above), i.e.,
H-VAR (t): 0, and V-VAR(x): 1.
• Press LL@)PICT to recover menu and return to PICT environment.
• Press (X,Y) to determine coordinates of any point on the graph. Use
™ and š to move the cursor in the plot area. At the bottom of the
screen you will see the coordinates of the cursor as (X,Y). The calculator
uses X and Y as the default names for the horizontal and vertical axes,
respectively.
• Press L@)CANCL to return to the PLOT WINDOW environment. Then,
press $ to return to normal calculator display.
More details on using graphical solutions of differential equations are
presented in Chapter 16.
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