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listprologlogicarithmetic-expressions

Dot product Prolog/3 need Hint for the SUM


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).

Solution

  • 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.