function w=shiftr(v,n)
%SHIFTR	 W=SHIFTR(V,N) performs the N steps right-shift function
%	 on matrix V, by rows.

siz=size(v);
w=zeros(siz);
if n<siz(2)
    w(:,n+1:siz(2))=v(:,1:siz(2)-n);
end