How to change the value of a vector through sub functions

Hello-

pretend:

prisoner = 1:2
outcomes = []
bias = .25
choice = zeros(1,2)

These are sub functions and I want to only change 1 element of the 'choice' vector eachtime the main function is called. How could this be done?

These are only a part of the subfunctions, but this is where I'm struggling..

%prisoner cooperate (1)
function [choice(1)] = prisoner_coop(prisoner,outcomes,bias)
choice(1) = 1
end
%prisoner defect (2)
function [choice(2)] = prisoner_defect(prisoner,outcomes,bias)
choice(2) = 0
end

[Brian Peoples]

let me know if this question needs anymore context

[Walter Roberson]

Which one element of choice should be changed?

When you say they are sub functions, do you mean that you have nested functions in which choice is a variable in the main function, so choice could act like a shared variable?

[Brian Peoples]

Yeah, they are nested functions and choice is a variable in the main function.

In my script I call the main function, but each nested function carries a different choice, but I want my script to show the choices of the different subfunctions, possibly stored in a different variable.

[Walter Roberson]

function your_main_function(appropriate,parameters,go,here)
  num_choice = 16;   
  choice = nan(1, num_choice);
  prisoners = randi(5,1,10);
  outcomes = [];
  bias = 0.25;
  prisoner_coop(prisoners, outcomes, bias);
  prisoner_defect(prisoners, outcomes, bias);
  
    function prisoner_coop(prisoner, outcomes, bias)
        choice(1) = 1;
    end
    function prisoner_defect(prisoner, outcomes, bias)
        choice(2) = 0;
    end
end

[Brian Peoples]

My main function can't have the same inputs as my sub functions?

also, i made an error in what i said. What I would need is a set of sub functions...

As in function....end function...end. My main function would not contain the other functions

[Walter Roberson]

Your main function can have whatever parameter you need . But you have to initialize them somewhere .

Matlab does not offer "subfunctions". It offers functions. Only the first function in a file can normally be invoked directly from outside the .m (except for static class methods) but you can have any number of function declarations in one .m

It is possible in some circumstances to declare a function inside of another function . Such functions are known as nested functions and can make use of shared variables .

I think you are saying that you are not using nested functions inside your main function . If that is the case you cannot use shared variables with it.

There are ways to change a unshared variable in a function from a function that it calls directly . That is not recommended . The recommended approach is nested functions with shared variables , or simply making the variable both an input and an output .

[Walter Roberson]

What does your project have to do with transfer functions or embedded matlab functions ? You tagged a number of things that look irrelevant at the moment .

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F