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172 Using Variables
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 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: