Application Guide

• Characters can consist of letters, digits, and the underscore character (_). Letters
can be U.S. or Greek letters (but not Π 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, a
2
, q
a
, or h
2
o). 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, b
12
, c, d
Yes. Note that variables b12 and b
12
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.
Using Variables 155