Texas Instruments TITANIUM TI-89 - Manual (Page 198)

Operating the Calculator 198
• Cannot be the same as a name that is preassigned by the calculator. Preassigned
names include:
- Built-in functions (such as abs ) and instructions (such as LineVert ). Refer to the
Technical Reference module.
- System variables (such as xmin and xmax , which are used to store graph-
related values). Refer to the Technical Reference module for a list.
Examples Examples Examples Examples
Data Types Data Types Data Types Data Types
Variable Description
myvar OK
a OK
Log Not OK, name is preassigned to the log function.
Log1 OK
3rdTotal Not OK, starts with a digit.
circumfer Not OK, more than 8 characters.
DataTypes Examples
Expressions
2.54, 1.25E6, 2 p , xmin/10, 2+3i, (x–2)
2
,
Lists {2 4 6 8}, {1 1 2}
2 2 ⁄