User manual TERRAILLON SYMPHONY

[. . . ] This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, you can try to correct the interference by one or more of the following measures: ?Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/television technician for help. Caution: Any changes or modifications to this equipment not expressly approved by Texas Instruments may void your authority to operate the equipment. 2005, 2010 Texas Instruments Incorporated Windows and Macintosh are trademarks of their respective owners. Getting Started Initial start-up Installing the AAA Batteries The TI-89 Titanium uses four AAA alkaline batteries and one button cell backup battery. [. . . ] If you store to a variable name only, it is stored in the current folder. For example: 5!start If you refer to a variable name only, that variable must be in the current folder. Otherwise, it cannot be found (even if the variable exists in a different folder). To store or refer to a variable in another folder, you must specify a path name. For example: 5!class\start (class = Variable name; start = Folder Name) ? ? After the program stops, any folder variables created by the program still exist and still take up memory. Local Variables Temporary variables that exist only while a program is running. To create a local variable in a program, use the Local command to declare the variable. A local variable is treated as unique even if there is an existing folder variable with the same name. Local variables are ideal for temporarily storing values that you do not want to save. Programming 592 Note: If a program has local variables, a graphed function cannot access them. For example: Local a 5!a Graph acos(x) may display an error or an unexpected result (if a is an existing variable in the current folder). Circular Definition Errors When evaluating a user-defined function or running a program, you can specify an argument that includes the same variable that was used to define the function or create the program. You can type a string directly, or you can store a string to a variable. Programming 598 How Strings Are Used A string is a sequence of characters enclosed in "quotes. " In programming, strings allow the program to display information or prompt the user to perform some action. or ? "Enter the angle in degrees?!str1 Input str1, ang1 Some input commands (such as InputStr) automatically store user input as a string and do not require the user to enter quotation marks. A string cannot be evaluated mathematically, even if it appears to be a numeric expression. For example, the string "61" represents the characters "6" and "1", not the number 61. Although you cannot use a string such as "61" or "2x+4" in a calculation, you can convert a string into a numeric expression by using the expr command. Programming 599 String Commands Note: See the Technical Reference module for syntax for all commands and functions. Command # & char dim expr Description Converts a string into a variable name. Important: Some user input commands store the entered value as a string. Before you can perform a mathematical operation on that value, you must convert it to a numeric expression. Returns an expression as a character string based on the format template (fixed, scientific, engineering, etc. ) Searches a string to see if it contains a specified substring. If so, inString returns the character position where the first occurrence of the substring begins. Returns a specified number of characters from the left side (beginning) of a string. [. . . ] If BATT is displayed in reverse text ( ), replace the batteries as soon as possible. A graph or program is paused and the TI-89 Titanium / Voyage 200 is waiting for input; press . Press N several times to exit any menu or dialog box and to return the cursor to the entry line. Be sure that the batteries are installed properly and that they are fresh. Appendix B: Technical Reference 946 Note: Correcting a ?lock up? [. . . ]