From: Kish Shen <kisshen_at_cisco.com>

Date: Sun, 04 Nov 2007 19:56:55 +0000

Date: Sun, 04 Nov 2007 19:56:55 +0000

Hi Amine, You are using lib(fd), the old finite domain solver. You may want to consider using the newer lib(ic) instead. Also, as the problm you are solving is an integer problem, and you say that the problem is solved efficiently with IP solver, you may want to try using lib(eplex) to solve your problem. This uses an external MP solver such as COIN-OR's CLP/CBC solvers or CPLEX, to solve your problem. In this case, you can specify either max or min for the objective function. Chagining the sign of the objective is the way to change the direction of optimisation. Using this should not affect the efficiency of solving your problem.-- many integer problems cannot be solved efficiently using finite domain solver. Cheers, Kish Amine Marref wrote: > Hi, > > I am new to Eclipse. Is it possible to maximize as opposed to minimize > an objective function? I have a problem that is solved efficiently > with an integer programming solver but does not seem to work in Eclipse. > > I want to use minimize/2 in order to maximize, for this I invert the > sign of the cost variable. In the file I attach, the objective is to > maximize the linear expression "Sum". > > Any help? > > ------------------------------------------------------------------------ > > _______________________________________________ > ECLiPSe-Users mailing list > ECLiPSe-Users_at_crosscoreop.com > http://www.crosscoreop.com/mailman/options/eclipse-usersReceived on Sun Nov 04 2007 - 19:57:25 CET

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