点产品Prolog/3要求SUM提示 [英] Dot product Prolog/3 need Hint for the SUM

问题描述

美好的一天，我在序言中进行算术问题，是的，它是我搜索过的点积，发现一堆乱码与本书所要问的内容并不相等.它是/3，所以这是我到目前为止的结果，但我需要对两个列表的乘积结果求和.关于应该建议做什么的任何提示?

Good Day I am doing the problema of arithmetic in prolog and Yes its the dot Product I have Searched and found a mess of code that did not equal to what the book is asking me. Its a /3 so this is what i have so far but i need to sum the result of the product of both list. Any hint on what should be recommended to do?

    dot([HD|TL],[HD2|TL2],Result):-
       Mul is HD2 * HD,
       dot(TL,TL2,Mul),
       Result is Mul + Reuslt2.
    dot([],[],0).

推荐答案

您的问题是，您两次使用Mul表示您打算一次使用它，而Reuslt2在任何地方都不存在.可能您的意思是:

Your problems are that you're using Mul twice where you mean to use it once, and Reuslt2 doesn't exist anywhere. Probably what you mean is:

dot([], [], 0).
dot([H1|T1], [H2|T2], Result) :- 
  Prod is H1 * H2,
  dot(T1, T2, Remaining),
  Result is Prod + Remaining.

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