Texas Instruments TI-82 User Manual - Page 78
Exploring a Graph with ZOOM
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Exploring a Graph with ZOOM Pressing q accesses a menu that allows you to adjust the viewing WINDOW of the graph quickly in a variety of ways. All of the ZOOM commands are accessible from programs. ZOOM Menu ZOOM MEMORY 1: ZBox 2: Zoom In 3: Zoom Out 4: ZDecimal 5: ZSquare 6: ZStandard 7: ZTrig 8: ZInteger 9: ZoomStat Draws box to define viewing WINDOW. Magnifies graph around cursor. Views more of graph around cursor. Sets .1 as dot size. Sets equal sized dots on X and Y axes. Sets standard WINDOW variables. Sets built-in trig WINDOW variables. Sets integer values on X and Y axes. Sets values for current lists. ZBox ZBox lets you use the cursor to select opposite corners of a box to define a new viewing WINDOW. 1. Select ZBox from the ZOOM menu. The different cursor at the center of the screen indicates that you are using a ZOOM instruction. 2. Move the cursor to any corner of the box you want to define and then press Í. As you move the cursor away from the point just selected, you see a small square dot, indicating that the first corner is selected. 3. Move the cursor to the diagonal corner of the box you want to define. As you move the cursor, the boundaries of the box change on the screen. Note: You can cancel ZBox any time before you press Í by pressing '. 4. When the box is defined as you want it, press Í to replot the graph. You can repeat steps 2 through 4 to do another ZBox. To cancel ZBox, press '. 3-16 Function Graphing
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