Symbolic variables in a for loop

Hi all,

I am trying to create a sum of, which has x and I want to create a for loop to give me the result below :

A= [x(2:N)-x(1:N-1)] + [x(2+N:2*N)-x(1+N:2*N-1)]+ ......

So I want to create something like that:

if true
j=1;
for i=0:5 %let's say I want the dum of the first five 

   B=(x(2+N*i):j*N)-(x((1+N*i):j*N-1))) %Something like that, so I can sum them 
j=j+1
end

Is it possible, to do it ?

Thanks