MATLAB: “Reiman sum Help”

MATLABreiman sum

I am using MATLAB and I am tring to do a Reiman Sum I keep getting an error saying:

???Error using ==> mtimes

Inner matrix dimensions must agree.

My code is: {

n1 = [0:1:50];

N1 = 1 ./ ((2 .* n1 + 1)*(2 .* n1 + 2));

N1Sum = sum(N1) } I don't see the problem and have tried several variations. Does anyone see my error?

N1 = 1 ./ ((2 .* n1 + 1) .* (2 .* n1 + 2));

Notice the .* instead of *

for i=1:3 
    fepsn(i)=i; % (i) was added to avoid overwriting of the variable 
end

out = 1;
for ii = 2:1000
   out = out + ii^2;
end