I wanna have that V_old takes on the values of V after a complete loop over j_now. However, V_old takes on the Values of V directly after each j_now iteration and therefore I get wrong values because the new V_old value is always part of the new maximum and so on. I wanna have that V_old takes on the values of
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Python：在每个循环之后指定向量值，但不是每次迭代
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