Example Of An "Off The Curve" Cursor - Texas Instruments TITANIUM TI-89 User Manual

For example, consider a saddle shape z1(x,y) = (x
the view looking down the y axis.
Now look at the same shape at 10¡ from the x axis (eyeq = 10).
You can move the cursor so
that it does not appear to be
on a grid point.
To cut away the front of the saddle in this example, set
Note:
negative x values.

Example of an "Off the Curve" Cursor

Example of an "Off the Curve" Cursor Example of an "Off the Curve" Cursor Example of an "Off the Curve" Cursor
Although the cursor can move only along a grid wire, you will see many cases where the
cursor does not appear to be on the 3D surface at all. This occurs when the z axis is too
short to show
z(x,y)
3D Graphing
for the corresponding x and y values.
2 2
) / 3. The following graph shows
Ny
If you cut away the front side,
you can see the cursor is
actually on a grid point on the
hidden back side.
to show only
xmax=0
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