Texas Instruments TITANIUM TI-89 - Manual (Page 381)

3D Graphing 381
8 Í
to set
Coordinates = POLAR .
Tool For 3D Graphs:
Free-Moving
Cursor The free-moving cursor is not available.
„
Zoom Works essentially the same as it does for function graphs,
but remember that you are now using three dimensions
instead of two.
• Only the following zooms are available:
2:ZoomIn , 3:ZoomOut , 5:ZoomSqr , 6:ZoomStd ,
A:ZoomFit , B:Memory , C:SetFactors
• Only x ( xmin , xmax ), y ( ymin , ymax ), and z ( zmin ,
zmax ) Window variables are affected.
• The grid ( xgrid , ygrid ) and eye ( eye q , eye f , eye
ψ
)
Window variables are not affected unless you select
6:ZoomStd (which resets these variables to their standard
values).
…
Trace Lets you move the cursor along a grid wire from one grid
point to the next on the 3D surface.
• When you begin a trace, the cursor appears at the
midpoint of the xy grid.
• QuickCenter is available. At any time during a trace,
regardless of the cursor’s location, you can press
¸
to
center the viewing cube on the cursor.
• Cursor movement is restricted in the x and y directions.
You cannot move the cursor beyond the viewing cube
boundaries set by
xmin , xmax , ymin , and ymax .