Texas Instruments TI86 User Manual - Page 37
Using Functions in Expressions, Using an Instruction, Entering Functions, Instructions, and Operators
UPC - 033317192342
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In this guidebook, optional arguments are shown in brackets ( ã and ä ). Do not include these brackets when you enter the arguments. The A to Z Reference describes all TI-86 functions and instructions, including their required and optional arguments. In the CATALOG, to move to the first item beginning with a letter, press that letter (as in ãLä in the example). Chapter 1: Operating the TI-86 25 Using Functions in Expressions A function returns a value. Some examples of functions are ÷ , L and log. To use functions, you usually must enter one or more valid arguments. When this guidebook describes the syntax of a function or instruction, each argument is in italics. For example: sin angle. Press = to enter sin, and then enter a valid angle measurement (or an expression that resolves to angle). For functions or instructions with more than one argument, you must separate each argument from the other with a comma. Some functions require the arguments to be in parentheses. When you are unsure of the evaluation order, use parentheses to clarify a function's place within an expression. Using an Instruction An instruction initiates an action. For example, ClDrw is an instruction that, when executed, clears all drawn elements from a graph. You cannot use an instruction in an expression. Generally, the first letter of each instruction name is uppercase on the TI-86. Some instructions take more than one argument, as indicated by an open parenthesis ( ( ) at the end of the name. For example, Circl( requires three arguments, Circl(x,y,radius). Entering Functions, Instructions, and Operators You can enter a function, instruction, or operator in any of three ways (log 45, for example). ♦ Paste it to the cursor location from the keyboard or a menu (< 45). ♦ Paste it to the cursor location from the CATALOG (- w & ãLä & & b 45). ♦ Enter it letter by letter ( - n 1 ãLä ãOä ãGä ¤ 1 1 45). As you can see in the example, using the built-in function or instruction typically is easier.