Vectorize sum of discount rates

Hi,

I want to vectorize the calculation of series like this: [R^0;R^0+R^1;R^0+R^1+R^2;...etc.

Im quite sure this should be easy, but i cant figure it out. Any help is greatly appreciated! :-)

[Jan]

What is "R"?

Answer 1

[Matt Fig]

R = 5;
cumsum(R.^(0:4))

Answer 2

[Matt J]

 out=1/(1-R).*(1-R.^(1:n));

Answer 3

[Jan]

R = 23;
n = 100;
x = repmat(R, 1, n);
x(1) = 1;
Result = cumsum(cumprod(x));

Answer 4

[Sargondjani]

thank you all for you answers... all did what i wanted, but the one by Matt Fig is the most simple