MATLAB: How can i calculate the sum of the following geometric series N= 1000 and r =0.99

homework

calculate the sum of the following geometric series N= 1000 and r =0.99 =1+r+r2+r3+…+rN

N=0:1000;
r = 0.99;
E = r.^N;
sum(E)

If your geometric series is a, a*r, a*r^2, ..., a*r^N, then its sum is:

s = a*(1-r^(N+1))/(1-r)

a=1; %first term
r=1/7;
n=5; %number of values in geometric series
s = a*r.^(0:n-1)

If you want sum, then write

gp_sum=sum(a*r.^(0:n-1))