External function problem.
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I am trying to alter this code which I have included and is functioning to use an external function.
After a few attempts but always returning errors I am at an end.
I have tried replacing line 8 and 9 with a function look up and recreating the function in the external file but it throws errors.
I believe it is a simple fix but am a bit stuck.
clear; close all; clc
balance(1) = 1000;
contribution = 1200;
M = 1; % month ticker
interest = 0.0025;
while true %this makes the program run until the break condition is met
M = M + 1; % you need to increment months + 1 every cycle
balance(M) = balance(M-1) + interest*balance(M-1) + contribution;
if balance(end) > 500000;
break;
end
end
years = M/12; %year counter
fprintf('%g Months until $500000 reached\n', M);
fprintf('%g Years until $500000 reached\n', years);
format bank
plot(balance);
grid on
ytickformat('usd')
title('Saving 3% compound')
xlabel('Months')
ylabel('Saving balance')
Label = max(balance) %this labels the plot with max balance
txt = {'Max Balance:',Label,'\leftarrow'};
text(M,Label,txt,'HorizontalAlignment','right')
4 个评论
Image Analyst
2021-9-18
Please attach the m-file balance.m -- which I guess is your external function.
采纳的回答
Walter Roberson
2021-9-18
in MATLAB, assigning to one of the input parameters only causes local changes, not change to variable passed in. To change the variable you need to return the new value and assign it to the appropriate location in the calling function.
3 个评论
Walter Roberson
2021-9-19
clear; close all; clc
balance(1) = 1000;
contribution = 1200;
M = 1; % month ticker
interest = 0.0025;
while true %this makes the program run until the break condition is met
M = M + 1; % you need to increment months + 1 every cycle
balance = account(balance, contribution, interest, M)
if balance(end) > 500000;
break;
end
end
years = M/12; %year counter
fprintf('%g Months until $500000 reached\n', M);
fprintf('%g Years until $500000 reached\n', years);
format bank
plot(balance);
grid on
ytickformat('usd')
title('Saving 3% compound')
xlabel('Months')
ylabel('Saving balance')
Label = max(balance) %this labels the plot with max balance
txt = {'Max Balance:',Label,'\leftarrow'};
text(M,Label,txt,'HorizontalAlignment','right')
function balance = account(balance, contribution, interest, M);
balance(M) = balance(M-1) + interest*balance(M-1) + contribution;
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