TI-83 Plus Function Graphing 139
Zoom Cursor
When you select 1:ZBox, 2:Zoom In, or 3:Zoom Out, the cursor on the
graph becomes the zoom cursor (+), a smaller version of the free-moving
cursor (+).
ZBox
To define a new viewing window using ZBox, follow these steps.
1. Select 1:ZBox from the ZOOM menu. The zoom cursor is displayed at
the center of the screen.
2. Move the zoom cursor to any spot you want to define as a corner of
the box, and then press Í. When you move the cursor away from
the first defined corner, a small, square dot indicates the spot.
3. Press |, }, ~, or †. As you move the cursor, the sides of the box
lengthen or shorten proportionately on the screen.
Note: To cancel ZBox before you press Í, press ‘.
4. When you have defined the box, press Í to replot the graph.