Texas Instruments TI-80 User Manual - Page 80
Function Graphing, Editing a, Function, Clearing a, Defining, Functions from, the Home Screen
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Editing a Function To edit a function in the Y= list: 1. Press ( to display the Y= list, and move the cursor to the function you want to change. 2. Make the changes. You can also press M to erase the expression, and then enter a new expression. The expression is stored in the Y= list and selected (turned on) as you edit it. Clearing a Function To clear or erase a function on the Y= edit screen, position the cursor anywhere on the function, and then press M. Defining Functions from the Home Screen or a Program To define a function from the Home screen or from a program, begin on a blank line. 1. Press ? ã"ä, enter the expression, and then press ? ã"ä again. 2. Press §. 3. Press 2 G, and then select the name of the function from the Y menu. The name is copied to the cursor location. 4. Press ¸ to complete the instruction. "expression"!Yn Leaving the Y= Edit Screen When the instruction is executed, the TI-80 stores the expression in the Y= list, selects (turns on) the function, and displays the message DONE. To leave the Y= edit screen: ¦ Select another screen by pressing the appropriate key, such as , or ). ¦ Press 2 . to return to the Home screen. 4-6 Function Graphing