User manual TEXAS INSTRUMENTS TI-80

[. . . ] TI-80 GRAPHING CALCULATOR GUIDEBOOK TI-GRAPH LINK, Calculator-Based Laboratory, CBL, CBL 2, Calculator-Based Ranger, CBR, Constant Memory, Automatic Power Down, APD, and EOS are trademarks of Texas Instruments Incorporated. © 1995­1997, 2001 by Texas Instruments Incorporated. Important Texas Instruments makes no warranty, either expressed or implied, including but not limited to any implied warranties of merchantability and fitness for a particular purpose, regarding any programs or book materials and makes such materials available solely on an "as-is" basis. In no event shall Texas Instruments be liable to anyone for special, collateral, incidental, or consequential damages in connection with or arising out of the purchase or use of these materials, and the sole and exclusive liability of Texas Instruments, regardless of the form of action, shall not exceed the purchase price of this calculator. Moreover, Texas Instruments shall not be liable for any claim of any kind whatsoever against the use of these materials by any other party. US FCC Information Concerning Radio Frequency Interference This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. [. . . ] To cancel LINE(, press M. From the Home Screen or a Program LINE( (DRAW DRAW, item 2) draws a line between the coordinates (X1, Y1) and (X2, Y2). LINE(X1, Y1, X2, Y2) For example, enter LINE(0, 0, 6, 9) on the Home screen, and then press ¸. 7-4 Draw Operations Drawing Horizontal and Vertical Lines While a graph is displayed, HORIZONTAL and VERTICAL let you define lines on the graph using the cursor. If a graph is not displayed, the instruction is copied to the Home screen. Directly on a Graph To draw horizontal and vertical lines directly on a graph: 1. When a graph is displayed, select HORIZONTAL (item 3) or VERTICAL (item 4) from the DRAW DRAW menu. The line is drawn on the graph. To continue to draw lines, repeat step 2. To cancel HORIZONTAL or VERTICAL, press M. From the Home Screen or a Program HORIZONTAL (DRAW DRAW, item 3) draws a horizontal line at Y=Y (which can be an expression, but not a list). HORIZONTAL Y VERTICAL (DRAW DRAW, item 4) draws a vertical line at X=X (which can be an expression, but not a list). VERTICAL X Note: In the example above, the horizontal line is drawn first, and then the vertical line is drawn. Draw Operations 7-5 Drawing a Function DRAWF (draw function) draws a function on the current graph. 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=. 2Xò­2X+6 is the only selected function, DRAWF Y1­5 plots Y1 and then draws the function Y1­5 when you press ¸. Note: You cannot trace on DRAWF functions. Using GRIDON and GRIDOFF 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 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 Shading Areas on a Graph There are three shading instructions on the DRAW DRAW menu: SHADE_Y>, SHADE_Y<, and SHADE(. These instructions are not interactive; they must be entered on the Home screen or in the program editor. Shading Areas above a Function SHADE_Y> (DRAW DRAW, item 6) takes up to four arguments (functions of X). , function4 When executed, SHADE_Y> plots the specified function(s) on the graph and shades the area above the function with a pattern. The patterns for shading are automatically assigned in the following order. Horizontal pattern. When you specify multiple functions, the shading is done sequentially. Draw Operations 7-7 Shading Areas below a Function SHADE_Y< (DRAW DRAW, item 7) takes up to four arguments (functions of X). , function4 When executed, SHADE_Y< plots the specified function(s) on the graph and shades the area below the function with a pattern. The patterns for shading are automatically assigned in the following order. Vertical pattern. Note that the patterns are assigned in reverse order from the SHADE_Y> patterns. When you specify multiple functions, the shading is done sequentially. 7-8 Draw Operations Shading a Graph SHADE( (DRAW DRAW, item 8) shades the area on a graph that is below one specified function and above another, between two X values. It draws lowerfunc and upperfunc in terms of X on the current graph and shades the area that is specifically above lowerfunc and below upperfunc. [. . . ] The warranty of the repaired or replacement unit will continue for the warranty of the original unit or six (6) months, whichever is longer. Other than the postage requirement, no charge will be made for such repair and/or replacement. TI strongly recommends that you insure the product for value prior to mailing. TI and its licensors do not warrant that the software will be free from errors or meet your specific requirements. [. . . ]