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174
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k Other Graph Functions with Dual Graph
After drawing a graph using Dual Graph, you can use the trace, zoom, sketch and
scroll functions. Note, however, that these functions are available only for the
active (left) graph. For details on using these functions, see “8-6 Other Graphing
Functions”.
•To perform any of the above operations on the inactive graph, first move the
inactive graph to the active screen.
• The graph screen will not scroll while a trace operation is being performed on
the active graph.
The following shows some example operations using the zoom function.
Example 1 To use box zoom to enlarge the graph of y = x (x + 1) (x – 1)
Use the following View Window parameters for the active graph.
Xmin = –2 Ymin = –2
Xmax = 2 Ymax = 2
Xscale = 0.5 Yscale = 1
Assume that the function is already stored in memory area Y1.
Press 6 (DRAW) or w to draw the graph.
!2(Zoom)1(BOX)
•Use the cursor keys to move the pointer to
one of the corners of the box and then press
w.
•Use the cursor keys to move to the opposite corner of the box and then press
w to enlarge the graph.
• The zoom operation changes the View Window parameters of the inactive
screen, so the graph in the inactive screen is cleared.
11 - 4 Displaying a Graph in the Inactive Screen
P. 128
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