Texas Instruments TI-89 User Manual - Page 891

Toolbar CATALOG Toolbar block EndTBar Creates a toolbar menu. block can be either a single statement or a sequence of statements separated with the ":" character. The statements can be either Title or Item. Items must have labels. A Title must also have a label if it does not have an item. Program segment: © :Toolbar : Title "Examples" : Item "Trig", t : Item "Calc", c : Item "Stop", Pexit :EndTbar © Note: When run in a program, this segment creates a menu with three choices that branch to three places in the program. Trace CATALOG Trace Draws a Smart Graph and places the trace cursor on the first defined Y= function at the previously defined cursor position, or at the reset position if regraphing was necessary. Allows operation of the cursor and most keys when editing coordinate values. Several keys, such as the function keys, O, and 3, are not activated during trace. Note: Press ¸ to resume operation. Try CATALOG Try block1 Else block2 EndTry Executes block1 unless an error occurs. Program execution transfers to block2 if an error occurs in block1. Variable errornum contains the error number to allow the program to perform error recovery. block1 and block2 can be either a single statement or a series of statements separated with the ":" character. Program segment: © :Try : NewFold(temp) : Else : ¦Already exists : ClrErr :EndTry © Note: See ClrErr and PassErr. Appendix A: Functions and Instructions 891