function s = cyclespin(x,k)
[xrow,xcol]=size(x);
 if k > 0
    s = [x(:,((xcol+1-k):xcol)) x(:,(1:(xcol-k)))];
 else
    s = [x(:,((-k+1):xcol)) x(:,(1:(-k)))];
 end

    
% k>0 means left,else means right  
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