MATLAB: How to fix the error Function definitions are not permitted at the prompt or in scripts.

Question

Hello,

Whenever I create a function on matlab, an error message appears as follows:

Error: Function definitions are not permitted at the prompt or in scripts.

For example this function which finds the factorial of an integer:

n=[1:100];
 function [y] = fact(n)
if(n<=1)
y=1;
else
y=n*fact(n-1)
end

Answer 1

Write this part of code and save it as fact.m

function y = fact(n)
if n<=1
  y=1;
else
  y=n*fact(n-1)
end

then call this function in Matlab Windows Command

n=5
out=fact(n)