This is machine translation

Translated by Microsoft
Mouse over text to see original. Click the button below to return to the English verison of the page.


Determine if input is valid variable name




tf = isvarname(s) determines if input s is a valid variable name. If s is a valid MATLAB® variable name the isvarname function returns logical 1 (true). Otherwise it returns logical 0 (false).

A valid variable name begins with a letter and contains not more than namelengthmax characters. Valid variable names can include letters, digits, and underscores. MATLAB keywords are not valid variable names. To determine if the input is a MATLAB keyword, use the iskeyword function.

isvarname s is the command form of the syntax. The command form requires fewer special characters. You do not need parentheses or single quotes around the input.


collapse all

Determine Variable Name Validity

Show that input that starts with a number is not a valid variable name.

s = '8th_column';
ans =


Change the input to a valid variable name.

s = 'column_8';
ans =


Use the command form to determine if the input is a valid variable name.

isvarname column_8
ans =


Input Arguments

collapse all

s — Potential variable namecharacter | string

Potential variable name, specified as a character or string.

Example: 'myVar'

Data Types: char

More About

Introduced before R2006a

Was this topic helpful?