Not sure why while loop won't run.

%trying to run a while loop, (then a for and a forever) but to me the code seems logical but it has a bug that is stopping it.

%The idea is it loops until the balance hits $500000 then plots a graph. kinda out of ideas...

clear; close all; clc
balance(1) = 1000;
contribution = 1200;
M(1) = 1; % month ticker
interest = 0.0025;
while balance < 500000
    
    balance(M) = balance(M-1) + interest*balance(M-1) + contribution;
    
    M(M) = M + 1; % you need to increment months + 1 every cycle
end 
%M(M) = M + 1;
plot(balance,M);

Answer 1

[Matt J]

balance(1) = 1000;
contribution = 1200;
interest = 0.0025;

M = 2; % month ticker
while balance(end) < 500000
    
    balance(M) = balance(M-1) + interest*balance(M-1) + contribution;
    
    M = M + 1; % you need to increment months + 1 every cycle
end
plot(balance);

[Chett Manly]

%Damn that was a simple mistake I had...

%Added some plot formatting and we are functioning.

balance(1) = 1000;

contribution = 1200;

M(1) = 2; % month ticker

interest = 0.0025;

while balance(end) < 500000

balance(M) = balance(M-1) + interest*balance(M-1) + contribution;

M = M + 1; % you need to increment months + 1 every cycle

end

format bank

plot(balance);

ytickformat('usd')

title('Saving 3% compound')

xlabel('Months')

ylabel('Saving balance')