Hi all, I'm returning to Prolog after a long break. I'd dearly love to become proficient in it but have a bit of a hill to climb at the moment. I am finding any and every example very helpful- thanks to anyone who published their work- every Prolog program is a work of art to me. I just wanted to point out that I think there is a problem with the crew.pl example linked from the main Eclipse website and I wonder if someone (far more proficient than me) could double-check as I've spent a lot of time tyring to work out whether the problem is me or the program! The problem centers around the "two-days-rest" clauses. This works for the data given but when the data approaches the limits of possibilty to satisfy the contraints (maximum crew members etc) the two-days-rest constraint seems to fly out of the cabin window! I know unions are weak these days but... ;-) I ran it with this data overnight (it took 5 hours): flights( [flight( 1,crew:6,stewards:3,stewardesses:3,french:1,spanish:1,german:1), flight( 2,crew:6,stewards:3,stewardesses:3,french:1,spanish:1,german:1), flight( 3,crew:6,stewards:3,stewardesses:3,french:1,spanish:1,german:1), flight( 4,crew:7,stewards:3,stewardesses:3,french:1,spanish:1,german:1), flight( 5,crew:7,stewards:3,stewardesses:3,french:1,spanish:1,german:1), flight( 6,crew:7,stewards:3,stewardesses:3,french:1,spanish:1,german:1) ] ). And no solution respected the two_days_off clauses. If the problem is my understanding- can someone explain briefly how this constraint can be decided as optional? Cheers! _________________________________________________________________ We want to hear all your funny, exciting and crazy Hotmail stories. Tell us now http://clk.atdmt.com/UKM/go/195013117/direct/01/Received on Sat Feb 06 2010 - 11:22:31 CET
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