troble in applying for loop

I want to apply for loop. Below is my code. I have applied the for loop which is wrong. Here Length(t) is sample numbers. Here I want to create 'for' loop for a sample number 5 in particular. so how to change the for loop. Moreover, 'phi_sync' shoud be sample number of 5 and 'phi_acc' shoud be summation from 0 to 5 sample numbers.

    fs = 200;
    ts = 1/fs;
    t = 0:ts:1-ts;
    fc = 50;
    S = cos(2*pi*fc*t);                    % equation 7.1 noisless
    sigma = 1.8;
    phi_sync =  sigma * randn(1,length(t));   % random variable with gaussian distributed
    phi_acc = sigma * randn(1,length(t));   % random variable with gaussian distributed
    % h = 0;
    for i=1:length(S)
        h = phi_sync + phi_acc(i);
    end

Answer 1

[Azzi Abdelmalek]

   k=0  
   h=zeros(size(1:5:numel(S)))
   for ii=1:5:numel(S)
        k=k+1
        h(k)= phi_sync(ii) + phi_acc(ii);
    end

[Kutru biladi]

Gey Aziz. Thanks for edit and reply. I want Phi_sync as only 5th element and phi_acc as summation from 1 to 5.

[Kutru biladi]

yes, its working. Thanks :)

[Azzi Abdelmalek]

Biladi, my name is Azzi not Aziz.

You don't need a for loop to do it

n=numel(t)
a=sigma * randn(1,n);
b=sigma * randn(1,n)
phi_sync = a(5)    
phi_acc = sum(b(1:5))

[Kutru biladi]

hey Aziz, this is not exactly i am looking for, now i realised. :D. as i told u before i want Phi_sync as only 5th element and phi_acc as summation from 1 to 5.

[Kutru biladi]

Sorry Azzi, for mispelling your name :D. ya now i got my answer.

[Kutru biladi]

Hey Azzi, one more questoion. now i want to add this h = phi_sync(5) + phi_acc(sum(1:5). how to get this h using for loop from o to n.

[Kutru biladi]

I mean now h(5) = phi_sync(5) + phi_acc(sum(1:5). i want h(1) to h(n) and after that i need to add this h in a signal. S1 = cos(2*pi*fc*t + h) so i will get phase noise