Texas Instruments TI-84 Guidebook - Page 81
Setting the Graph Format, RectGC, CoordOn, GridOff
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1. Enter the value you want to store. 2. Press ¿. 3. Press to display the VARS menu. 4. Select 1:Window to display the Func window variables (X/Y secondary menu). • Press ~ to display the Par and Pol window variables (T/q secondary menu). • Press ~ ~ to display the Seq window variables (U/V/W secondary menu). 5. Select the window variable to which you want to store a value. The name of the variable is pasted to the current cursor location. 6. Press Í to complete the instruction. When the instruction is executed, the TI-84 Plus stores the value to the window variable and displays the value. @X and @Y The variables @X and @Y (items 8 and 9 on the VARS (1:Window) X/Y secondary menu; @X is also on the Window screen) define the distance from the center of one pixel to the center of any adjacent pixel on a graph (graphing accuracy). @X and @Y are calculated from Xmin, Xmax, Ymin, and Ymax when you display a graph. ΔX = (---X----m-----a---x----------X----m-----i-n----) ΔY = (---Y----m-----a---x----------Y----m-----i-n----) 94 62 You can store values to @X and @Y. If you do, Xmax and Ymax are calculated from @X, Xmin, @Y, and Ymin. Note: The ZFrac ZOOM settings (Zfrac1/2, ZFrac1/3, ZFrac1/4, ZFrac1/5, ZFrac1/8, ZFrac1/10) change @X and @Y to fractional values. If fractions are not needed for your problem, you can adjust @X and @Y to suit your needs. Setting the Graph Format Displaying the Format Settings To display the format settings, press y .. The default settings are highlighted below. Note: You can also go to the Format Graph screen from the Mode screen by selecting YES at the GoTo Format Graph prompt. After you make changes, press z to return to the Mode screen. RectGC PolarGC Sets cursor coordinates. CoordOn CoordOff Sets coordinates display on or off. GridOff GridOn Sets grid off or on. Chapter 3: Function Graphing 74