Re: [Help-glpk] i need some help

[Andrew Makhorin]

> i need some help to modelling this model in
> GLPK.
>  
> i dont know how to represent upper and lower bounds
> in the sum.
>  
> I try this, but wasnt sucessfull.:
>  
> /* objetive function */
> minimize z: 
> sum{i in TAREFAS, t in TEMPOS: t<=tempo_total-tempo_producao[i]+1} 
> custo[i,t]*x[i,t];
> /* constraints */
>  
> /*todas atividades devem ser executadas*/
> s.t. rest1{i in TAREFAS}: 
> sum{t in TEMPOS} x[i,t] = 1; 
>  
> /*maximo uma atividade por período*/
> s.t. rest2{t in TEMPOS}: sum{i in 
> TAREFAS, s=t-tempo_producao[i]+1 .. t}x[i,s] <= 1;

Probably you can write something like this:

minimize z:
sum{i in 1..n, t in 1..T - p[i] + 1) c[i,t] * x[i,t];

and so on.

Could you provide the terminal output from the solver? Is there a
syntactic error, or the solution seems to be wrong?