CODEWITHSUNDEEP
optimizationmodelsyntax-errorconstraintsampl
ghina salsabila rosyid
ghina salsabila rosyid

Reputation: 1

in my AMPL model its came out with Syntax Error

I use AMPL for my thesis anybody can help me? it is always come out with "error syntax" in constraint area. Anybody can help this? I hope anybody can help my model, cause its for my thesis.

#VARIABLE
var Allocated {I,D,T} integer;              # allocated to group i in district d in time period t (y_idt)
var Stored {D,T}integer;                    # stored in district d warehouse in time period t (w_dt)
var Shipped {K,D,T} integer;                # shipped from distribution center k to district d warehouse in time-period t (x_kdt)
var Distribution_Center_set_up {K} binary;  # 0/1 if distribution center k is set up / don't set up (omega_k)
var miu integer;                            # new free variable

#OBJECTIVE FUNCTION
maximize Z: miu

#CONSTRAINT
subj to Newcon {i in I, d in D, t in T}: 
    miu <= Allocated [i,d,t] / total_demand [i,d];
    
subj to con_2 {i in I, d in D}: 
    sum {t in T} Allocated[i,d,t] >= coverage_rate[i] * total_demand[i,d];
    
subj to con_3 {d in D, t in {1}}: 
    sum {DistributionCenter} Shipped[k,d,t] - sum {GroupType} Allocated;
    
subj to con_4 {d in D, t in T diff {1}}: 
    sum {DistributionCenter} Shipped[k,d,t] - sum {GroupType} Allocated; 
    
subj to con_5 {k in K, t in T}: 
    sum {DemandPoint} Shipped[k,d,t] <= the_max_capacity[k,t];
    
subj to con_6 {k in K, d in D, t in T}:
    Shipped[k,d,t] * Distribution_Center_set_up [k];
    
subj to con_7: 
    sum {DistributionCenter} cost_of_setting_up[k] * Distribution_Center_set_up[k] 
        + sum {DistributionCenter,DemandPoint,TimePoint} per_dose_purchasing_cost * Shipped[k,d,t] 
            + sum {DistributionCenter,DemandPoint,TimePoint}  per_dose_transportation_cost[k,d] * Shipped[k,d,t] 
                + sum {DemandPoint,TimePeriode} per_dose_holding_cost[d] * Stored[d,t] <= budget;

Upvotes: 0

Views: 78

Answers (1)

Davi Doro
Davi Doro

Reputation: 378

subj to is not a valid keyword for declaring constraints in AMPL. Use either subject to or the shorter version s.t.

However, if that is your whole program, it is missing the set declarations (I, D, T and K).

If you are new to AMPL, you may want to read some AMPL introduction, such as this. There is a section on constraint declaration here.

Upvotes: 0

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