Texas Instruments TI-89 Voyage 200, User Manual

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Programming 600
To Perform Symbolic Calculations
To Perform Symbolic Calculations To Perform Symbolic Calculations
To Perform Symbolic Calculations
If you want a function or program to perform symbolic calculations, you must use a
global variable instead of a local. However, you must be certain that the global variable
does not already exist outside of the program. The following methods can help.
• Refer to a global variable name, typically with two or more characters, that is not
likely to exist outside of the function or program.
• Include
DelVar
within the function or program to delete the global variable, if it exists,
before referring to it. (
DelVar
does not delete locked or archived variables.)
String Operations String Operations String Operations String Operations
Strings are used to enter and display text characters. You can type a string directly, or
you can store a string to a variable.