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Home > Forums > Programmers > Languages > Prolog Forum

Count the number of results.Helpful Member! 

thread345-1621992
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Tenes (IS/IT--Management)
29 Sep 10 16:57
Hello,

Suppose we have this example (my real problem has 45 regions here is only 7):

%Coloring Australia
coloring(Wa,Nt,Sa,Ql,Nsw,V,T):-


%Country borders relation to other Countries
different(Wa,Nt),
different(Wa,Sa),
different(Nt,Wa),
different(Nt,Sa),
different(Nt,Ql),
different(Sa,Wa),
different(Sa,Nt),
different(Sa,Ql),
different(Sa,Nsw),
different(Sa,V),
different(Ql,Nt),
different(Ql,Sa),
different(Ql,Nsw),
different(Nsw,Ql),
different(Nsw,Sa),
different(Nsw,V),
different(V,T).
%different(T,V).


%Color relation to other Colors
different(yellow,blue).
different(blue,yellow).
different(yellow,red).
different(red,yellow).
different(blue,red).
different(red,blue).

I want to count how many different results the query
coloring(Wa,Nt,Sa,Ql,Nsw,V,T). will give.

Thanks in advance
Helpful Member!  joel76 (Programmer)
30 Sep 10 3:21
You can use setof/3 to get the list of all the different solutions, then use length/2 to get the number of these solutions.
Tenes (IS/IT--Management)
30 Sep 10 4:38
Can you give me an example?

I only need a counter with the results (in this example is 12).

 
joel76 (Programmer)
30 Sep 10 5:53
try

CODE

setof([Wa,Nt,Sa,Ql,Nsw,V,T], coloring(Wa,Nt,Sa,Ql,Nsw,V,T), L), length(L, N).
Tenes (IS/IT--Management)
30 Sep 10 6:24
you are the best joel thx
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