MATLAB: Summing to create a vector

vector

I'm trying to write a function that calculates sum of ((-1)^k *sin((2k+1)t))/((2k+1)^2 ( for k=0 to n) t varies from 0 to 4*pi with 1001 values its supposed to return a vector with size n this is the code i wrote
function [summ ]= triangle_wave (n) 
for k=1:n;
 for t= linspace(0,4*pi,1001); 
summ=sum((-1)^k*sin((2*k+1)*t))/((2*k+1)^2); 
end 
end 
end
it keeps outputting the last calculate sum instead of adding each sum to the vector . what can i add to this code to achieve that ?

Best Answer

function [summ ]= triangle_wave (n) 
  t = linspace(0,4*pi,1001);
  summ = zeros(n+1, length(t));
  for k = 1 : n;
    summ(k+1,:) = summ(k,:) + (-1).^k .* sin((2*k+1) .* t)) ./ ((2*k+1).^2); 
  end 
  summ = summ(2:end,:);
end
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