[eclipse-users] Hash tables inside loops inside minimize don't work

From: David Norman <dn4096_at_...32...>
Date: Wed, 11 Jul 2007 16:23:20 -0500
I can't seem to get a hash table to update when used inside a do loop inside a minimize goal.  The hash remains empty.  I'm running version 5.10 #77 on windows.
 
Any ideas?Thanks,David
 
 
Sample Code:
 
:- lib(hash).:- lib(ic).:- lib(branch_and_bound).
test_hash(Keys, Values) :-
    List = [1, 2, 3],
        minimize(        (            X :: 1 .. 10,            indomain(X),            Y #= -X,
            hash_create(TheHash),            (                foreach(Key, List),                param(TheHash)            do                 Val is 2 * Key,
                hash_set(TheHash, Key, Val),
                hash_list(TheHash, Keys, Values),                hash_count(TheHash, Count),                printf("Hash contents in loop %w %w size %w\n", [Keys, Values, Count])            ),
            hash_list(TheHash, Keys, Values),            hash_count(TheHash, Count),            printf("Hash contents after loop %w %w size %w\n", [Keys, Values, Count]),                        hash_list(TheHash, Keys, Values)        ),        Y ),            printf( "X %w Y %w\n", [X, Y] ).
 
 
Execution:
 
?- test_hash(Keys, Values).Keys = []Values = []Yes (0.02s cpu)
 
Output:
 
Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -1Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -2Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -3Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -4Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -5Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -6Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -7Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -8Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -9Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents in loop [] [] size 0Hash contents after loop [] [] size 0Found a solution with cost -10Found no solution with cost -1.0Inf .. -11X 10 Y -10
 
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Received on Wed Jul 11 2007 - 22:23:30 CEST

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