A function has inputs and outputs, for example
function a =my_fun(x)
a=22+x;
end
Here you are getting 'a' as the output of your function while 'x' is your input. Inside this function you see, you can use 'x'.
Now if you store this as my_fun.m in your directory, on the command line you can use
a = my_fun(2)
then you will get the output like
a = 24
since inside the function we add 22 to the input of the function.
