CP- Cumulative Constraint

[Andres Collart]

Hi,

I'm new to CP and am having some issues getting the Cumulative constraint working properly. Any guidance is really appreciated. I'm solving a RCPSP.

solver = pywrapcp.Solver('Problem')

#Vars

S=[solver.FixedDurationIntervalVar(0,LS[a],Duration[a],False,\

        "S_%s"%a) for a in A]

#Objective

Cmax=solver.Max([S[a].EndExpr() for a in A])

print "Adding Precedence Constraint" , time.clock()

#Add Precedence

for (a,aa) in Prec:

    #solver.Add(S[aa].StS[a].EndExpr()<= S[aa])

    solver.Add(S[aa].StartsAfterEnd(S[a]))

print "Adding Resource Constraints", time.clock()

for r in set(R).intersection(set(r_more)):

    ss=[S[a] for a in A if Demand[a,r]>0]

    #dd=[Duration[a] for a in A if Demand[a,r]>0]

    rr=[Demand[a,r] for a in A if Demand[a,r]>0]

    solver.Cumulative(S, rr, Budget[r])

When it gets to this last line it errors out with the following code: NotImplementedError: Wrong number or type of arguments for overloaded function 'Solver_Cumulative'. 

I've checked a few examples but not sure how to get it working properly. Thanks in advance.

[Andres Collart]

Still unable to get Cumulative working on this, any help is much appreciated.

Thank you,

Andres

[Laurent Perron]

Here is a correct example:

def test_cumulative_api():

  solver = pywrapcp.Solver('Problem')

  #Vars

  S=[solver.FixedDurationIntervalVar(0, 10, 5,False, "S_%s"%a)

     for a in range(10)]

  C = solver.IntVar(2, 5)

  D = [a % 3 + 2 for a in range(10)]

  solver.Add(solver.Cumulative(S, D, C, "cumul"))

You need to name your cumulative constraints, like the disjunctive ones. "" is OK.

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[Andres Collart]

Thanks Laurent, that really clears things up and I've got it working now.

-Andres