n=-4:2;
y=[1,-2,4,6,-5,8,10];
maxShift = 10; % maximum shift that you may want,
% you can't shift more than this value,
% you should set this value high enough
% I could set it to be 2 here, but I prefer 10
n=min(n)-maxShift:1:max(n)+maxShift; % define proper range for n
y=[zeros(1,maxShift), y, zeros(1,maxShift)]; % add zeros to the begining and
% end of y
z= circshift(y',-2) + circshift(y',1); % calculate your new signal. you need
% transpose of y ==> y'
