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Not sure why while loop won't run.

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Chett Manly
Chett Manly on 13 Sep 2021
Commented: Chett Manly on 13 Sep 2021
%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);

Accepted Answer

Matt J
Matt J on 13 Sep 2021
Edited: Matt J on 13 Sep 2021
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);
  1 Comment
Chett Manly
Chett Manly on 13 Sep 2021
%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')

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