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Jaccard index: Difference between revisions
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J(F,E) = 0
J(F,F) = 1
</pre>
=={{header|Prolog}}==
<lang prolog>
show([]).
show([X|Xs]):- write(X), show(Xs).
j(N,M,X):- M > 0 -> X is N/M; X is 1.
task:- L = [[], [1,2,3,4,5], [1,3,5,7,9], [2,4,6,8,10], [2,3,5,7], [8]],
member(A,L), member(B,L),
findall(X, (member(X,A), member(X,B)), I), length(I,N),
findall(X, (member(X,B), not(member(X,A))), T), append(A,T,U), length(U,M),
j(N,M,J), show(["A = ",A,", B = ",B", J = ",J]), nl, fail; true.
</lang>
{{out}}
<pre>
?- task.
A = [], B = [], J = 1
A = [], B = [1,2,3,4,5], J = 0
A = [], B = [1,3,5,7,9], J = 0
A = [], B = [2,4,6,8,10], J = 0
A = [], B = [2,3,5,7], J = 0
A = [], B = [8], J = 0
A = [1,2,3,4,5], B = [], J = 0
A = [1,2,3,4,5], B = [1,2,3,4,5], J = 1
A = [1,2,3,4,5], B = [1,3,5,7,9], J = 0.42857142857142855
A = [1,2,3,4,5], B = [2,4,6,8,10], J = 0.25
A = [1,2,3,4,5], B = [2,3,5,7], J = 0.5
A = [1,2,3,4,5], B = [8], J = 0
A = [1,3,5,7,9], B = [], J = 0
A = [1,3,5,7,9], B = [1,2,3,4,5], J = 0.42857142857142855
A = [1,3,5,7,9], B = [1,3,5,7,9], J = 1
A = [1,3,5,7,9], B = [2,4,6,8,10], J = 0
A = [1,3,5,7,9], B = [2,3,5,7], J = 0.5
A = [1,3,5,7,9], B = [8], J = 0
A = [2,4,6,8,10], B = [], J = 0
A = [2,4,6,8,10], B = [1,2,3,4,5], J = 0.25
A = [2,4,6,8,10], B = [1,3,5,7,9], J = 0
A = [2,4,6,8,10], B = [2,4,6,8,10], J = 1
A = [2,4,6,8,10], B = [2,3,5,7], J = 0.125
A = [2,4,6,8,10], B = [8], J = 0.2
A = [2,3,5,7], B = [], J = 0
A = [2,3,5,7], B = [1,2,3,4,5], J = 0.5
A = [2,3,5,7], B = [1,3,5,7,9], J = 0.5
A = [2,3,5,7], B = [2,4,6,8,10], J = 0.125
A = [2,3,5,7], B = [2,3,5,7], J = 1
A = [2,3,5,7], B = [8], J = 0
A = [8], B = [], J = 0
A = [8], B = [1,2,3,4,5], J = 0
A = [8], B = [1,3,5,7,9], J = 0
A = [8], B = [2,4,6,8,10], J = 0.2
A = [8], B = [2,3,5,7], J = 0
A = [8], B = [8], J = 1
true.
</pre>
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