How to set the value of a variable in one function from another?

I have a function in its own file that has the variable n. I want to run the function in a loop incrementing the value for n each time in another function file. I am able to access the value of n if its set prior but I dont know how to change it from my second function.

Any help would be greatly appreciated.

Its something like this.

function[n,x,y] = f1
   n;
   //code that does stuff with n
end

Then in my second function I have the following loop where I call f1 and want to change the value of n each time/

function f2
  for k=1:5
    n=k
    [n,x,y] = f1
  end
end

[KSSV]

n is the out put from f1 obtained after some calculation. Why and how you want to change it?

Answer 1

[per isakson]

Modify the function so that f1 takes n as an input argument

function [n,x,y] = f1( n )
n;
//code that does stuff with n
end

function f2
for k=1:5
    n=k
    [n,x,y] = f1( n );
end
end

[Ryan O Malley]

Thank you, just figured it out!