Need help to create a function for a roulette simulation?

My function does not work and i don't know how to link my input number n with the simulation of the roulette.

There are 18 red, 18 black and 1 green fields. If the ball lands on the field which the user choose then he gets the money back and gets the same amount of money which he used. if the ball lands not on the field which the user choose then he loose his money.

function [red, black] = n_montecarlo(n)

red = [3 12 7 18 9 14 1 16 5 23 30 36 27 34 25 21 19 32];
black = [26 35 28 29 22 31 20 33 24 10 8 11 13 6 17 2 4 15];

roulette = randi(37); 

for n = red
    if roulette == n
    disp('win')
    else 
        disp('lose')
    for n = black
        if roulette == n
            disp('win')
    else 
        disp('lose')
        end
    end
    end
end
end           

Answer 1

[Jan]

"If the ball lands on the field which the user choose"

How does thze user choose a field? By the input n? This input is overwritten by

for n = red    

Perhaps you want:

function n_montecarlo(n)
red   = [3 12 7 18 9 14 1 16 5 23 30 36 27 34 25 21 19 32];
black = [26 35 28 29 22 31 20 33 24 10 8 11 13 6 17 2 4 15];

roulette = randi(37);
if n == roulette
    disp('win')
else
    disp('lose')
end

if any(n == red)
    disp('red')
elseif any(n == black)
    disp('black')
else
    disp('green')
end
end           

[Steven Thies]

I appreciate that a lot. Thank you man thats perfect. And i can work with that. Now i understand the concept.

[Steven Thies]

How can i put the function into a script. When i put the function in my script it does not work.

[Jan]

Please explain, what "put function into a script" and "it does not work" exactly means. Post your code and the error message or explain the difference between the results and your expectations.

[Steven Thies]

I want a Script which asks the User to choose between red or black. There are 18 red, 18 black and 1 green fields on the roulette. If the ball lands on the colour of the field which the user choosed then the user gets his money back and the same amount of money to total. If the ball lands not on the field which the user choosed before then he loose his money. The Script should tell the user how much money he won or lost with disp.

Thank you for your time.

[Steven Thies]

This is my Script. The function is n_montecarloreal(n) which i have already.

n = input('please choose a number.For red(3,12,7,18,9,14,1,16,5,23,30,36,27,34,25,21,19,32),black(26,35,28,29,22,31,20,33,24,10,8,11,13,6,17,2,4,15): ','s');
while isnan(str2double(n)) == true 
    n = input('Error.Please again ','s');   
end
n = str2double(n); 
m = n_montecarloreal(n);
output = (num2str(m));
disp(output)

function n_montecarloreal(n)
red   = [3 12 7 18 9 14 1 16 5 23 30 36 27 34 25 21 19 32];
black = [26 35 28 29 22 31 20 33 24 10 8 11 13 6 17 2 4 15];

roulette = randi(37);

if n == roulette
    disp('win')
else
    disp('lose')
end

if any(n == red)
    disp('red')
elseif any(n == black)
    disp('black')
else
    disp('green')
end
end           

[Jan]

Your function n_montecarloreal(n) does not have an output yet. Maybe all you need is:

function Won = n_montecarloreal(n)
roulette = randi(37);
Won      = (roulette == n);
end