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[Help-glpk] i need some help


From: Renato
Subject: [Help-glpk] i need some help
Date: Fri, 1 Jun 2007 18:20:38 +0400

hi all,

 

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;

 

 

any help is welcome.

 

thanks to all.

 

Renato Diniz

address@hidden

 





 
hi all,
 
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;
 
 
any help is welcome.
 
thanks to all.
 
Renato Diniz
 

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