Texas Instruments TI-80 User Manual - Page 97
The Window, By means of
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Displaying a Graph VARS WINDOW and Y-VARS Menus When you press ,, the TI-80 plots the selected parametric equations. It evaluates both the X and the Y component for each value of T (from TMIN to TMAX in intervals of TSTEP) and then plots each point defined by X and Y. The Window variables define the viewing window. As a graph is plotted, the TI-80 updates X, Y, and T. Note: Smart Graph applies to parametric graphs also (page 4-11). By means of the VARS WINDOW... and Y-VARS menus, you can: ¦ Access functions by using the name of the component of the equation as a variable. ¦ Select or deselect parametric equations from a program, using the FNON and FNOFF commands (page 4-8). ¦ Store parametric equations. ¦ Store values directly to Window variables. Parametric Graphing 5-5