DEC2HEX DEC2HEX Convert Decimal Number to Hexadecimal Usage Converts an integer value into its hexadecimal representation. The syntax for its use is y = dec2hex(x) where x is an integer (and is promoted to a 64-bit integer if it is not). The returned value y is a string containing the hexadecimal representation of that integer. If you require a minimum length for the hexadecimal representation, you can specify an optional second argument y = dec2hex(x,n) where n indicates the minimum number of digits in the representation.