Compound interest in a for loop

Question

Petch Anuwutthinawin 2021-6-12

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/854345-compound-interest-in-a-for-loop

编辑： Petch Anuwutthinawin 2021-6-12

I need to create a loop to calculate the compound interest of a Roth IRA each year. The function has to input p(principal amount), c(yearly contribution), r(return rate), and n(number of years). It has to output a v vector of values in the account the first day of each year. I have written a loop that should calculate the yearly compound interest through the y=equation, and then add it to the vector v. However this loop only prints out the initial values p. How do I make this create a vector of compount interests. I also have to plot the vector that comes out versus the year, but I have no idea what syntax to use to do that.

v=p;
for N=2:length(n)
    y=(v*(1+r).^N+c)
    v=v+y(N);  
end

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Answer 1

Sulaymon Eshkabilov 2021-6-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/854345-compound-interest-in-a-for-loop#answer_723055

编辑：Sulaymon Eshkabilov 2021-6-12

在 MATLAB Online 中打开

v=p;
for N=2:length(n)
    y(N)=(v(N-1)*(1+r).^N+c)
    v(N)=v(N-1)+y(N);  % specify the index and you will get all the values  
end

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Sulaymon Eshkabilov 2021-6-12

编辑：Sulaymon Eshkabilov 2021-6-12

在 MATLAB Online 中打开

v=p;
for N=2:length(n)
    y(N)=(v(N-1)*(1+r).^N+c);
    v(N)=v(N-1)+y(N);  % specify the index and you will get all the values  
end
disp(y)
disp(v)
% or
% fprintf(...)