Write script using matlab

The factorial n! of a positive number (integer) is defined by n!n(n-1) (n-2) 3.2 1, where 0! 1. Write a user-defined function that calculates the factorial n! of a number. For function name and arguments, use y-fact (x), where the input argument x is the number whose factorial is to be calculated and the output argument y is the value x! The function displays an error message if a negative or non-integer number is entered when the function is called. Do not use MATLAB built-in function factorial. Use fact with the following numbers