Replace every nth element in a vector

Hey guys,

I struggle with a rather simple question. I would like to generate a zero-vector with the length of the projectlength and then replace every xth value (which equals the lifetime) with the costs.

projectlength = 50;
costs = 30;
lifetime = 10;
Inv = zeros(projectlength,1);  
Inv(0:lifetime:projectlength)= costs; 

I do not seem to get it right (Error message: Array indices must be positive integers or logical values.) although it is quite simple, I guess. Thanks for helping out!

Answer 1

[Timo Dietz]

You must not start your index with '0' but with '1'

Inv(1:lifetime:projectlength)= costs;