How to code this?

I want to code and graph(xlabel:n, ylaberl:epsilon).

I study matlab now first time.

I search everything but I can't solve it.

I think below code helps me, but I don't know how to use it.

time=linspace(-pi,pi,1000);
partial_sum=0;

%Complex Function represented in terms of time and amplitude value

t=[-pi,-pi,0,0,pi,pi];
value=[0,-1,-1,1,1,-1];
handle1=line(t,value,'color','r','linewidth',2);
grid onhold on 
axis([-pi pi -1.5 1.5])
%Since the given complex function exhibits odd periodic extension

%only Bn term is valid with n=1,3,5,...

for n=1:2:200 %Odd terms to consider for partial sums
    %Plot 1 period of the given function    
    partial_sum=partial_sum+(4/(n*pi))*sin(n*time); %Fourier Series Expansion using Sine terms
    error=mean((abs(partial_sum)-1).^2); %Error Criteria
    handle2=plot(time,partial_sum,'k','linewidth',2);
    title(['Square Wave Partial Sum:  n = ',num2str(n),'  Error = ',num2str(error)])
    pause
    set(handle2,'Visible','off');
    if error<0.01
        break
    end
end

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers

[Walter Roberson]

You should really avoid naming a variable error because error is a very important MATLAB routine. At the very least you are going to confuse people reading the code.

[Walter Roberson]

The line

grid onhold on

needs to be

grid on
hold on

Answer 1

[Image Analyst]

Hint: look up linspace() and sum() in the help.

Answer 2

[Walter Roberson]

Tell MATLAB you want to create a new script. Paste the above code into it, and fix the problems I noted in the comments above. Then in the editor, click on the Run button. A graph will be produced, and the bottom of the command area will tell you to press any key to continue. Press return and the graph will be updated. Press return again and the graph will be updated again. Keep pressing return until the bottom of the command area no longer tells you to press any key to continue.

That is how you use that code.