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POProlog fd_domain is being undefined
 

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  1. POProlog fd_domain is being undefined
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    <p>OK, so I am trying to code this simple sudoku solver for a school project. I am using SWI - Prolog, and I am using library clpfd.</p> <p>The problem arises when I use domain/3 predicate. It is giving no syntax errors whatsover, only the program is returning "false" rather than the actual solution.</p> <p>Excuse me for my Noobness, but I am completely new to Prolog and declarative languages.</p> <p>Here is my full code:</p> <pre><code>:- use_module(library(clpfd)). sudoku(Solution,Puzzle):- Solution = Puzzle, Solution =[[A1,A2,A3,A4,A5,A6,A7,A8,A9], [B1,B2,B3,B4,B5,B6,B7,B8,B9], [C1,C2,C3,C4,C5,C6,C7,C8,C9], [D1,D2,D3,D4,D5,D6,D7,D8,D9], [E1,E2,E3,E4,E5,E6,E7,E8,E9], [F1,F2,F3,F4,F5,F6,F7,F8,F9], [G1,G2,G3,G4,G5,G6,G7,G8,G9], [H1,H2,H3,H4,H5,H6,H7,H8,H9], [I1,I2,I3,I4,I5,I6,I7,I8,I9]], valid_domain(Puzzle,1,9), %Squares Sqr1 = [A1,A2,A3,B1,B2,B3,C1,C2,C3], Sqr2 = [A4,A5,A6,B4,B5,B6,C4,C5,C6], Sqr3 = [A7,A8,A9,B7,B8,B9,C7,C8,C9], Sqr4 = [D1,D2,D3,E1,E2,E3,F1,F2,F3], Sqr5 = [D4,D5,D6,E4,E5,E6,F4,F5,F6], Sqr6 = [D7,D8,D9,E7,E8,E9,F7,F8,F9], Sqr7 = [G1,G2,G3,H1,H2,H3,I1,I2,I3], Sqr8 = [G4,G5,G6,H4,H5,H6,I4,I5,I6], Sqr9 = [G7,G8,G9,H7,H8,H9,I7,I8,I9], %Rows Row1 = [A1,A2,A3,A4,A5,A6,A7,A8,A9], Row2 = [B1,B2,B3,B4,B5,B6,B7,B8,B9], Row3 = [C1,C2,C3,C4,C5,C6,C7,C8,C9], Row4 = [D1,D2,D3,D4,D5,D6,D7,D8,D9], Row5 = [E1,E2,E3,E4,E5,E6,E7,E8,E9], Row6 = [F1,F2,F3,F4,F5,F6,F7,F8,F9], Row7 = [G1,G2,G3,G4,G5,G6,G7,G8,G9], Row8 = [H1,H2,H3,H4,H5,H6,H7,H8,H9], Row9 = [I1,I2,I3,I4,I5,I6,I7,I8,I9], %Columns Col1 = [A1,B1,C1,D1,E1,F1,G1,H1,I1], Col2 = [A2,B2,C2,D2,E2,F2,G2,H2,I2], Col3 = [A3,B3,C3,D3,E3,F3,G3,H3,I3], Col4 = [A4,B4,C4,D4,E4,F4,G4,H4,I4], Col5 = [A5,B5,C5,D5,E5,F5,G5,H5,I5], Col6 = [A6,B6,C6,D6,E6,F6,G6,H6,I6], Col7 = [A7,B7,C7,D7,E7,F7,G7,H7,I7], Col8 = [A8,B8,C8,D8,E8,F8,G8,H8,I8], Col9 = [A9,B9,C9,D9,E9,F9,G9,H9,I9], valid([Row1, Row2, Row3, Row4, Row5, Row6, Row7, Row8, Row9, Col1, Col2, Col3, Col4, Col5, Col6, Col7, Col8, Col9, Sqr1, Sqr2, Sqr3, Sqr4, Sqr5, Sqr6, Sqr7, Sqr8, Sqr9]), show([Row1, Row2, Row3, Row4, Row5, Row6, Row7, Row8, Row9]). valid_domain(List, Min, Max):- domain(List, Min, Max). %HERE IS THE ERROR% valid([]). valid([H|T]):- all_different(H), valid(T). show([]). show([H,T]):- show_row(H), write('|'), nl, show(T). show_row([]). show_row([H,T]):- write('|'), write(H), show_row(T). </code></pre> <p>My Query:</p> <pre><code>sudoku(Solution, [4,8,7,_,5,_,_,6,_, 9,_,_,4,_,_,_,_,3, 2,_,6,_,8,9,5,_,_, _,_,4,_,1,5,6,_,_, 1,_,_,_,_,4,_,5,_, _,7,8,2,_,_,_,_,_, _,_,_,_,_,8,_,7,_, 7,5,_,_,_,_,_,3,_, _,2,_,_,3,7,4,1,_]). </code></pre>
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      1. POProlog fd_domain is being undefined
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      1. POProlog fd_domain is being undefined
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