d.elem() = peekSpin(l.elem(),row,col);
d.elem() = peekSpin(l.elem(),row);
peekSpin(const RScalar<T>& l, int row, int col){  typename UnaryReturn<RScalar<T>, FnPeekSpinMatrix>::Type_t  d;  d.elem() = peekSpin(l.elem(),row,col);  return d;}