HP -28S Manual page 96

Digitize the point.
em§]
Move the cross hairs to the desired upper-right corner.
Digitize the point.
em§]
Return to the stack display.
IONI
I, , , , ,.:t:'~
, , , ,
, I
I, , , , ,1,:,~
, , , ,
,I
3:
2: (-1.5,1.2)
1: (2.1,3.6)
BmIl1mJom:JlDIlIHImImmmDI
The coordinates of the lower-left corner, represented by a complex
number, are in level 2. The coordinates of the upper-right corner are
in level 1. (Your coordinates may differ slightly from the illustration.)
Redefine the upper-right corner of the plot, using
PMAX
(plot
maxima).
PMAX
3:
2:
1: (-1.5,1.2)
BmIl1mJom:JlDIlIHImImmmDI
The coordinates are taken from the stack and used to adjust the plot-
ting parameters.
Redefine the lower-left corner of the plot, using
PMI..,
(plot minima).
PMIN
ILmmimImmmammmmJl
7: Plotting 95