How to access the 3rd element in a for loop?

investment = 1000;
interestRate = 0.01;
months =[1:12];
for month = months
    investment = investment * (1 + interestRate);
end

Displays:

investment = 1010

investment = 1020.1

investment = 1030.3

investment = 1040.6

investment = 1051.0

investment = 1061.5

investment = 1072.1

investment = 1082.9

investment = 1093.7

investment = 1104.6

investment = 1115.7

investment = 1126.8

Answer 1

[Walter Roberson]

You would have to evalc() an invocation of the for loop, and do text processing on the output.

We would recommend that you instead record the values as you go.

investment = 1000;
interestRate = 0.01;
months =[1:12];
for month = months
    investment(month+1,1) = investment(month,1) * (1 + interestRate);
end

format long g
investment

investment = 13×1

1.0e+00 * 1000 1010 1020.1 1030.301 1040.60401 1051.0100501 1061.520150601 1072.13535210701 1082.85670562808 1093.68527268436

The third output of the loop would then be investment(4) [because investment(1) is the initial value]

[Steven Gangano]

Thank you! Can you explain the part:

investment(month+1,1)

What does month+1 do?

Answer 2

[KSSV]

investment = zeros(13,1);
investment(1) = 1000;
interestRate = 0.01;
months =[1:12];
for month = months
    investment(month+1) = investment(month) * (1 + interestRate);
end
investment(4)

ans = 1.0303e+03