Originally posted by: sej123

Hi for all,
I'm new at this forum so please be placable.
I start to experiment with CPLEX but I have some errors :/
When the formula is written there is no mistakes but when I run the configuration there are some errors.
I try to make mathematical model to solve to problem of the company to maximize the profits.
this is fragment of the model:

subject to
{ forall(t in 1..T) 
{        he[t]<=Et[t]; sum(t in 1..T) he[t]<=E; Y[t-1]+X[t]-sum(p in 1..P)m[p][t]*Z[p]==Y[t]; X[t]<=M[t]; Y[t]<=RS; 
} forall(t in 1..T,p in 1..P) 
{ s[p][t-1]+n[p][t]+m[p][t]+r[p][t]==D[p][t]+s[p][t]; 
} forall(p in 1..P) 
{ S0[p]==s[p][0]; 
}
}

And there are mistakes:

CPLEX(

default) cannot extract expression: forall(t in 1..12) (((he[(t)] <= Et[(t)] && sum(t in 1..12) he[(t)] <= 100) && Y[(t+(-1))]+X[(t)]+(sum(p in 1..10) m[(p)][(t)]*Z[(p)])*(-1) == Y[(t)]) && X[(t)] <= M[(t)]) && Y[(t)] <= 10000.   CPLEX(

default) cannot extract model: IloAlgorithm cannot extract extractable.   Index out of bound 

for array 
"Y": 0.   OPL cannot extract expression: ((((he[(t)] <= Et[(t)] && sum(t in 1..12) he[(t)] <= 100) && Y[(t+(-1))]+X[(t)]+(sum(p in 1..10) m[(p)][(t)]*Z[(p)])*(-1) == Y[(t)]) && X[(t)] <= M[(t)]) && Y[(t)] <= 10000) && Y[0] == 0.

Thank for your time and help.
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#OPLusingCPLEXOptimizer

Hi

what is the range of your decision variable array Y? I think it does not contain 0 and it should because of your constraint

Y[t-1]+X[t]-sum(p in 1..P)m[p][t]*Z[p]==Y[t];

and that is why you get

Index out of bound for array "Y": 0.

Alex
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#OPLusingCPLEXOptimizer

Originally posted by: sej123

Thank you very much for your help.
It solved the problem
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: telangana

Hi ,

int n = ...;//number of weeks
int W0 = ...;//number of workers
int I0 = ...;//initial inventory
int j = ...;//number of units produced per week
int k =...;// cost of hiring a worker 
int l = ...;//cost of firing a worker 
int r = ...;//salary to employ worker 
int p =...;//production cost 
int e= ...;//inventoy cost 

 range weeks =1..n; 
 
 int demand[weeks]=...;
 int W[weeks]=...;
 int H[weeks]=...;
 int F[weeks]=...;
 int I[weeks]=...;
 int C[weeks]=...;
 //variable
  dvar int x[weeks];
  //objective function
  minimize  sum(t in weeks) (k*H[t]+l*F[t]+r*W[t]+p*x[t]+e*I[t]);
  //constraints
  subject to 
  {
  forall(t in 1..n )
    conso1:
    W[t]== W[t+(-1)]+H[t]-F[t];
    
    forall(t in 1..n)
      conso2:
    I[t]==I[t-1]+x[t]-demand[t];
     
     W0==5;
     I0==20;
    
      
  }
   And there are errors:

Index out of bound for array "W": 0.

OPL cannot extract expression: conso1: W[t] == W[(t+(-1))]+H[t]+F[t]*(-1).

CPLEX(default) cannot extract expression: forall(t in 1..5) conso2: I[t] == I[(t+(-1))]+x[t]+demand[t]*(-1).

and the range of weeks is 1..5.

 

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#OPLusingCPLEXOptimizer

Hi,

can you attach also the .dat so that other users may help you ?

regards

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