Simple for Loop calculation help MATLAB!

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Tri Dang 2021-6-16

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评论： Chunru 2021-6-16

采纳的回答： Chunru

Matlab

I want to calculate anual compound of an investment using for loop, lets call its P is a final value.

I have 3 variables P0 the investment amount, r is rate, and y=years.

Can you help me outline the code using for loop to calculate the annually compound P if 3 variables are fixed?

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Answer 1

Chunru 2021-6-16

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Using loop (for integer number of years):

P0 = 1000;
r = 0.05;
y = 3;
P = P0;     % initialization
for i=1:y
    P = P0*(1+r);
end
fprintf('P=%.2f\n', P);
P=1050.00

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Tri Dang 2021-6-16

thank you so much

for the second part, how can I write a code, lets call it a #term (i) which is a min number of term require for the value of P to exceed 3 times the orignial value of P0 with given r

Chunru 2021-6-16

在 MATLAB Online 中打开

This is brute force method using loop. There is close-form formula for such problem.

P0 = 1000;
r = 0.05;
y = 0;
P = P0;
while true
    y = y + 1;
    P = P*(1+r);
    if P>=3*P0
        break;
    end
end
fprintf('y=%d, P=%.2f\n', y, P)
y=23, P=3071.52
    