How to create a loop

This is my code. How can i create a loop to remove dubble coding.

e(1) = ;        %Primary expenditure at starting point
e(2) = e(1)*(1+ge)/(1+y);
e(3) = e(2)*(1+ge)/(1+y); 
e(4) = e(3)*(1+ge)/(1+y); 
e(5) = e(4)*(1+ge)/(1+y); 
e(6) = e(5)*(1+ge)/(1+y); 
e(7) = e(6)*(1+ge)/(1+y); 
e(8) = e(7)*(1+ge)/(1+y); 
e(9) = e(8)*(1+ge)/(1+y); 
e(10) = e(9)*(1+ge)/(1+y); 
e(11) = e(10)*(1+ge)/(1+y); 
e(12) = e(11)*(1+ge)/(1+y);
e(13) = e(12)*(1+ge)/(1+y); 
e(14) = e(13)*(1+ge)/(1+y); 

[Stephen23]

Simpler to write vectorized code:

https://www.mathworks.com/help/matlab/matlab_prog/vectorization.html

Answer 1

[Jan]

e = zeros(1, 14);   % Pre-allocate
for k = 2:14
    e(k) = e(k-1) * (1 + ge) / (1 + y);
end

[Adam]

With

e(1) = ...

whatever it needs setting to between creation of e and the for loop.

Answer 2

[Stephen23]

A geometric series really is simpler to write using vectorized code:

k = (1+ge)/(1+y);
e0 * k.^(0:13)