# Simple for Loop calculation help MATLAB!

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Tri Dang on 16 Jun 2021
Commented: Chunru on 16 Jun 2021
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?

Chunru on 16 Jun 2021
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
##### 2 CommentsShowHide 1 older comment
Chunru on 16 Jun 2021
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

R2021a

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