HP HP-28S - Page 97

Try another plot.
DRAW
I/~I
Since you changed the height and width of the plot, both the vertical
and horizontal scales are changed.
The
plot shows two extrema in the expression's graph-a local maxi-
mum and a local minimum. In the next chapter you'll use the Solver
to find a precise value for
the minimum. To avoid repeating all these
steps to generate
our current plotting parameters, store the current
value of PPAR in a variable with a different name. To recreate this
plot in the next chapter, you'll restore PPAR to its current value.
Return to the stack display.
IONI
Put the current contents of PPAR on the stack.
INEXTI PPAR
1: { (-1.5
t
1.2)
(2.1,3.0) X 1 (0,0)
)
DDEBllIIIBtmmlmDlm.
For information about the plotting parameters and for details about
plotting in general, see npLOT" in the Reference Manual.
Create a variable PPARI
that contains the current plotting
parameters.
~ PPAR 1 I 8TO I
Now you're ready to use the Solver to find precise numbers for the
zero and local minimum of the expression.
96 7: Plotting