Hi to everyone,
I am new in matlab programming and this is one of my first tries to complete a programme. I would like to find the sum of the fourier coefficients, the first ten at first, using a for loop and then plot them against t (duration).And then I must also plot the sum of three specific terms of the fourier coefficients (2,4,6)

The fourier series coefficients are: 

A0=1/2   ,   Ak=2/π*k (for k:odd) ,  Ak=0 (for k even, greater than 0)

matlab code:

clear
% initialize variables
SR=44100;    % sample rate
Tf=2.0;       %duration       
N=10;        % number of fourier coefficients
t=[0:1/SR:Tf];   % duration 2 seconds with an 1/44100 step

fc=ones(1,N);  % put ones to vector fc


%for loop that finds the even and odd fourier coefficients

for n=2:N             
    if mod(n,2)==1;
        fc(n)=2/(pi*n);
    else
        fc(n)=0;
    end
end


f(1)=0.5;     % the first coefficients(which is the zero one), is 0.5.
x=ones(1,N);  %put ones to an new vector x
x(1)=f(1);    %  the first value of x is equal to 0.5.  


for n=2:N
    
 x(n)=fc(n)+x(n-1);  % a for loop that adds the fourier coefficients starting for f(1)=0.5
       
end

   x 

I have done this until now..Although,I have the correct sum resaults I think that I have made some mistake in the use of for loop...
 The most serious for me is that  i cannot plot x against t. How can I plot different sized vectors? I am not sure if I have understand it well.I have tried to see their sizes and then change x length like t length but the plot was not right.
 This exercise also suggests to change the sample rate in order to see the differences in the plot. 
I hope this would be clear for you..
Thanks in advance..
Nikolas