Variable and function names that you create must meet the following naming rules.
Note: In the unlikely event that you create a variable with the same name as one used for statistical analysis or by the Finance Solver, an error condition could occur. If you begin entering a variable name that is already in use in the current problem, the software shows the entry in bold to let you know.
| • | Variable names must be in one of the forms xxx or xxx.yyy. The xxx part can have 1 to 16 characters. The yyy part, if used, can have 1 to 15 characters. If you use the xxx.yyy form, both xxx and yyy are required; you cannot start or end a variable name with a period “.”. |
| • | Characters can consist of letters, digits, and the underscore character (_). Letters can be U.S. or Greek letters (but not P or p), accented letters, and international letters. |
| • | Do not use c or n from the symbol palette to construct a variable name such as c1 or n12. These may appear to be letters, but they are treated internally as special symbols. |
| • | You can use uppercase or lowercase letters. The names AB22, Ab22, aB22, and ab22 all refer to the same variable. |
| • | You cannot use a digit as the first character of xxx or yyy. |
| • | You can use digits 0 through 9, U.S. letters, a - z, Latin and Greek letters (but not p) as subscripts (for example, a2, qa, or h2o). To enter a subscript while typing a variable name, select  in the Math Templates or on the formatting toolbar. |
| • | Do not use spaces. |
| • | If you want a variable to be treated as a complex number, use an underscore as the last character of the name. |
| • | CAS: If you want a variable to be treated as a type of unit (such as _m or _ft), use an underscore as the first character of the name. You cannot use subsequent underscores in the name. |
| • | You cannot use an underscore as the first character of the name. |
| • | You cannot use a preassigned variable, function, or command name, such as Ans, min, or tan. |
Note: For more information about TI-Nspire™ functions, see the Reference Guide.
| • | Library documents and library objects are subject to additional naming restrictions. For more information, see Libraries. |
Here are some examples:
|
Variable names |
Valid? |
|
Myvar, my.var |
Yes |
|
My var, list 1 |
No. Contains a space. |
|
a, b, b12, b12, c, d |
Yes. Note that variables b12 and b12 are distinct. |
|
Log, Ans |
No. Preassigned to a system function or variable. |
|
Log1, list1.a, list1.b |
Yes |
|
3rdTotal, list1.1 |
No. xxx or yyy starts with a digit. |