Texas Instruments TI-80 User Manual - Page 11

Glossary This glossary provides definitions for important terms that are used throughout this guidebook. Argument Command Expression Function Home Screen Instruction List Menu Items An argument is an input upon which the value of a function depends. A command is any entry submitted to the calculator using ¸. There are two types of TI-80 commands: instructions and expressions. An expression is a complete sequence of numbers, variables, functions, and their arguments that can be evaluated to a single answer. An expression returns the evaluated result to ANS. A function, which may have arguments, returns a value and can be used in an expression. A function is also the expression entered in the Y= editor used in graphing. The Home screen is the primary screen of the TI-80, where expressions can be entered and evaluated and instructions can be entered and executed. An instruction, which may have arguments, initiates an action. Instructions are not valid in expressions. An instruction does not return a value to ANS. A list is a set of values that the TI-80 can use for activities such as evaluating a function at multiple values and entering statistical data. Menu items are shown on full-screen menus. Introduction xi