Re: [eclipse-clp-users] Problem using probe_sched

From: Kish Shen <kisshen_at_...5...>
Date: Fri, 02 Oct 2009 01:04:21 +0100
Riyadh Jemal wrote:
> I wanted to use eclipse to create a scheduling application and tried
> running the examples in the library documentation for the probe_sched/5.
> I get the following error:
> 
> "number expected in cplex_set_obj_coeff('EPLEX_OSI'(16'9146e48), 0, 1)"
> 
> I also get the same error in the program I wrote. Can anyone suggest the
> reason for this error.
> 
> Best Regards
> Riyadh
> 
> 
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Hi Riyadh,

There are two probe_sched/5 -- one in lib(ic_probing_for_scheduling), 
the other in lib(probing_for_scheduling), which is the older version 
that uses the old lib(fd) rather than lib(ic). You did not say which one 
you are using -- you should use the ic version (ic_probing_for_scheduling).

I compiled the example in the documentation you get from
    help ic_probing_for_scheduling:probe_sched/5.
i.e. the following code (after loading lib(ic_probing_for_scheduling)):

probe_schedule(Starts,CostFun) :-
	Starts=[X,Y,Z],
         ic:(Starts::1..10),
         Durations=[10,5,5],
         Resources=[R1,R2,R3],
         ic:(R1::1..2), R2=2, R3=1,
         MaxResource=2,
         [OldX,OldY,OldZ]=[1,5,5],
         CostFun= abs(X-OldX)+abs(Y-OldY)+abs(Z-OldZ),
	probe_sched(Starts,Durations,Resources,MaxResource,CostFun).

and run this with the query probe_schedule(S,C), and this succeeded 
without returning an error.

Could you give more details on what you did to get your error? Without 
this, it is difficult to help you; the error looks strange -- from 
looking at the code for cplex_set_obj_coeff/3 (which is implemented in 
C, and is an internal predicate used by lib(eplex)), it should only 
return the number expected error if the third argument is not a number, 
but in your error message, the third argument does look like a number -- 1.

-- Kish Shen



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Received on Fri Oct 02 2009 - 01:23:10 CEST

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