Texas Instruments TI-82 Manual page 13

13
G T G : TI-82
RAPHING ECHNOLOGY UIDE
Figure 2.34: ZOOM menu Figure 2.35: One corner selected
Press ENTER to fix the corner where you have moved the cursor; it changes shape and becomes a blinking square
(Figure 2.35). Use the arrow keys again to move the cursor to the diagonally opposite corner of the new rectangle
(Figure 2.36). If this box looks all right to you, press ENTER. The rectangular area you have enclosed will now
enlarge to fill the graph window (Figure 2.37).
You may interrupt the zoom any time before you press this last ENTER. Press ZOOM once more and start over.
Press CLEAR or GRAPH to cancel the zoom, or press 2nd QUIT to cancel the zoom and return to the home screen.
Figure 2.36: Box drawn Figure 2.37: New viewing rectangle
You can also gain a quick magnification of the graph around the cursor's location. Return once more to the standard
3
+ 4x and y = –.25x. Press ZOOM 2 and then press arrow keys to
window for the graph of the two functions y = –x
move the cursor as close as you can to the point of intersection near x = 2 (see Figure 2.38). Then press ENTER and
the calculator draws a magnified graph, centered at the cursor's position (Figure 2.39). The range variables are
changed to reflect this new viewing rectangle. Look in the WINDOW menu to verify this.
Figure 2.38: Before a zoom in Figure 2.39: After a zoom in
As you see in the ZOOM menu (Figure 2.34), the TI-82 can Zoom In (press ZOOM 2) or Zoom Out (press ZOOM
3). Zoom out to see a larger view of the graph, centered at the cursor position. You can change the horizontal and
vertical scale of the magnification by pressing ZOOM ► 4 (see Figure 2.41) and editing XFact and YFact, the
horizontal and vertical magnification factors.
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