% row sum% function Z=rsum(X)function Z=rsum(X)[N M]=size(X);Z=zeros(N,1);if M==1,  Z=X;elseif M<2*N,  for m=1:M,    Z=Z+X(:,m);  end;else  for n=1:N    Z(n)=sum(X(n,:));  end;end