tf = isvarname(s)determines if inputsis a valid variable name. Ifsis a valid MATLAB^®variable name theisvarnamefunction returns logical1(true). Otherwise it returns logical0(false).

A valid variable name begins with a letter and contains not more thannamelengthmaxcharacters. 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 theiskeywordfunction.

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