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Re: [Help-glpk] min() & max() functions alternatives to use non numeric


From: nikel90
Subject: Re: [Help-glpk] min() & max() functions alternatives to use non numeric parameters
Date: Wed, 27 Apr 2011 12:42:36 -0700 (PDT)

unfortunately i knew it...

i dont really know glpk... its possible to do something like

var a; 

if (b==1) a=b;
else 
a= c;


?? ty

Nikel


nikel90 wrote:
> 
> Good evining!
> 
> I've got a problem with the max() and min() functions...
> 
> i need to do something like this:
> min(120,ScorteIniziali+PrimoStd+PrimoStra)*70
> in my "objective function"
> 
> but min() accepts only numeric parameters..
> 
> is there any alternatives?
> 
> thank you!
> 
> Nikel
> 
> the entire model:
> 
> #
> #
> /* Trimestri*/
> var PrimoStd >=0, integer;
> var SecondoStd >=0, integer;  
> var TerzoStd >=0, integer;
> var QuartoStd >=0, integer;
> var PrimoStra >=0, integer;
> var SecondoStra >=0, integer;  
> var TerzoStra >=0, integer;
> var QuartoStra >=0, integer;
> var ScorteIniziali >=0, integer;
> #
> /* Objective function */
> maximize z:
> (min(120,ScorteIniziali+PrimoStd+PrimoStra)*70)-(((max(PrimoStd,SecondoStd,TerzoStd)*3*10)+(PrimoStra*3*15))+(max(0,ScorteIniziali+PrimoStd+PrimoStra-120)*6)+((PrimoStd+PrimoStra)*15))
> +
> (min(310,ScorteIniziali+PrimoStd+PrimoStra-120+SecondoStd+SecondoStra)*70)-(((max(PrimoStd,SecondoStd,TerzoStd)*3*10)+(SecondoStra*3*15))+(max(0,ScorteIniziali+PrimoStd+PrimoStra-120+SecondoStd+SecondoStra-310)*6)+((SecondoStd+SecondoStra)*15))
> + (min(180,ScorteIniziali+PrimoStd+PrimoStra-120 +
> SecondoStd+SecondoStra-310+TerzoStd+TerzoStra)*70)-(((max(PrimoStd,SecondoStd,TerzoStd)*3*10)+(TerzoStra*3*15))+(max(0,ScorteIniziali+PrimoStd+PrimoStra-120
> +
> SecondoStd+SecondoStra-310+TerzoStd+TerzoStra-180)*6)+((TerzoStd+TerzoStra)*15))
> + (min(120,ScorteIniziali+PrimoStd+PrimoStra-120 +
> SecondoStd+SecondoStra-310 +
> TerzoStd+TerzoStra-180+QuartoStd+QuartoStra)*70)-(((max(PrimoStd,SecondoStd,TerzoStd)*3*10)+(QuartoStra*3*15))+(max(0,ScorteIniziali+PrimoStd+PrimoStra-120
> + SecondoStd+SecondoStra-310 +
> TerzoStd+TerzoStra-180+QuartoStd+QuartoStra-120)*6)+((QuartoStd+QuartoStra)*15))
> - (ScorteIniziali*45 + ScorteIniziali+PrimoStd+PrimoStra-120 +
> SecondoStd+SecondoStra-310 + TerzoStd+TerzoStra-180 +
> QuartoStd+QuartoStra-120*45);
> 
> /* Constraints */
> #
> s.t. a: ScorteIniziali - ScorteIniziali+PrimoStd+PrimoStra-120 +
> SecondoStd+SecondoStra-310 + TerzoStd+TerzoStra-180 +
> QuartoStd+QuartoStra-120  <= 0;
> end;
> 
> 

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