HP F2226A - 48GII Graphic Calculator User Manual page 419

Graphing calculator
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The coordinates XE, YE, ZE, stand for "eye coordinates," i.e., the coordinates
from which an observer sees the plot. The values shown are the default values.
The Step Indep: and Depnd: values represent the number of gridlines to be
used in the plot. The larger these number, the slower it is to produce the
graph. For the time being we'll keep the default values of 10 and 8 for the
Step data.
Press @ERASE @DRAW to draw the three-dimensional surface.
wireframe picture of the surface.
Press @EDIT L @LABEL @MENU to see the graph with labels and ranges. This
particular version of the graph is limited to the lower part of the display.
We can change the viewpoint to see a different version of the graph.
Press LL@) P ICT @CANCL to return to the PLOT WINDOW environment.
Change the eye coordinate data to read :
Press @ERASE @DRAW to see the surface plot.
Press @EDIT L @LABEL @MENU to see the graph with labels and ranges.
This version of the graph occupies more area in the display than the
previous one. We can change the viewpoint, once more, to see another
version of the graph.
Press LL@) P ICT @CANCL to return to the PLOT WINDOW environment.
Change the eye coordinate data to read :
The result is a
XE:0
YE:-3
ZE:3
XE:3
YE:3
ZE:3
Page 12-38

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