Texas Instruments TI-80 User Manual - Page 110
Drawing a Function
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Drawing a Function DRAWF (draw function) draws a function on the current graph. DRAWF must be entered on the Home screen or in the program editor. Drawing a Function DRAWF (draw function, DRAW DRAW, item 5) is not an interactive operation. It draws the specified expression as a function in terms of X on the current graph. DRAWF expression For example, if Y1=.2Xò-2X+6 is the only selected function, DRAWF Y1-5 plots Y1 and then draws the function Y1-5 when you press ¸. Using GRIDON and GRIDOFF Note: You cannot trace on DRAWF functions. GRIDON (DRAW DRAW, item 9) and GRIDOFF (DRAW DRAW, item 0) set graphs to be drawn with the grid points on or off, respectively. The grid points correspond to the axes tick marks. The default for the TI-80 is GRIDOFF. 1. From the Home screen, press 2 F to display the DRAW menu. 2. Press 9 to select GRIDON, or press 0 to select GRIDOFF. 3. Press ¸. The message DONE is displayed. The next time the graph is displayed, the grid points will be on if you selected GRIDON, or off if you selected GRIDOFF. 7-6 Draw Operations