How can I get a good lowpass figure ?

% Partial Fraction H(z)
j = sqrt(-1);
omega = 0:(2*pi)/320:(2*pi)-(2*pi)/320;
H = zeros(320,1);

for i = 1:6

     H = H + r(i)/(1 -exp(p(i)))*exp(-j*omega);

end
plot(H)

[Walter Roberson]

What is r? What is p?

One problem you have is that your omega is 1 x 320 but you are trying to add that to H which is 320 x 1

[Image Analyst]

Not sure what your ultimate goal is here. Are you trying to illustrate the Central Limit Theorem or something? Do you want to repeatedly convolve a function? What is a "lowpass figure"? Do you mean a low-pass filtered image? Like a blurred image? Do you mean a figure with a line plot of a curve or something? You can't really low pass the whole "figure" which is what MATLAB calls a window with various controls on it (axes, text, sliders, images, graphs, buttons, etc.)