MATLAB: Plotting partial sums of series

for loopplottingsummation

Hello! I am trying to calculate and plot on -pi≤x≤pi for k=1:1:20. I want to plot each partial sum with a pause and retain the plots with my hold on function. So far I have the code written below. I have tried writing it as a function but I don't understand them. I have included some of my reasoning below. Thank you so much for any help you can provide. 
x = -pi:0.1:pi ; S=x; %initializing x
for n=1:20 %n is loop index
    x = sin(n*x)/n ;
    S(n)= x ;%storing the partial sum
    hold on %I'm trying to retain each plot but it plots them all on the same plot
    n=length(S);
    plot(n,S)%I have problems when trying to plot the product as if I
    %use x = -pi:0.1:pi) the length isn't the same and it won't plot anything
    pause(0.5)
end

Best Answer

Do you mean something like this?
x = -pi:0.1:pi ;  %initializing x
S = zeros(20,numel(x));
figure
xlim([1 20])
grid
hold on
for n=1:20 %n is loop index
    S(n) = sum(sin(n*x)/n) ;  %storing the partial sum
    plot(1:n,S(1:n),'k')
    pause(0.5)
end
Related Question