Global variables. How to write global variables?

I need to create scripts and functions in which data is exchanged only through global variables. I need to create a script with vector from 2*pi to -2*pi with step -0.1; and this script should calculate this function:

and I have created script and 2 functions.

Script:

The answer is good but I need to make global variables and I have no clue how to overwrite this script ant functions. Any ideas?

[James Tursa]

Why do you think you need to use global variables? It is usually best to avoid them and simply pass around your variables via the input/output argument lists, like you already have with the PIRMAS(x) and ANTRAS(x) functions. Rather than rewriting your functions to use global variables, I would write your calling code to use argument passing (which it looks like it already does).

[dovis838]

Idk, my professor gave this task to try global variables and realize how it works... -,- and I know that it is useless but still, I need to manage somehow to do this task

Answer 1

[Adam Danz]

Sounds like a wild assignment. Anyway, here's an example.

global x                        %declare global var
x = 5;                          %give global var a value
rn = drawRand(7);

function y = drawRand(n)
global x                        %within a separate function, declare the same global var
y = rand(n,1) .* x;             
end