Texas Instruments TI89TITANIUM User Manual - Page 309
Selecting Functions to Graph, From the Home Screen or a Program, Selecting or Deselecting Functions
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From the Home Screen or a Program You can also define and evaluate a function from the Home screen or a program. • Use the Define and Graph commands. Refer to: - "Graphing a Function Defined on the Home Screen" and "Graphing a Piecewise Defined Function" in Additional Graphing Topics. - "Overview of Entering a Function" in Programming. • Store an expression directly to a function variable. Refer to: - "Storing and Recalling Variable Values" in Operating the Calculator. - "Creating and Evaluating User-Defined Functions" in Calculator Home Screen. Note: User-defined functions can have almost any name. However, if you want them to appear in the Y= Editor, use function names y1(x), y2(x), etc. Selecting Functions to Graph Regardless of how many functions are defined in the Y= Editor, you can select the ones you want to graph. Selecting or Deselecting Functions Press 8 # to display the Y= Editor. A "Ÿ" indicates which functions will be graphed the next time you display the Graph screen. Basic Function Graphing 309