Re: [Help-glpk] operating following / has invalid

[glpk xypron]

Hello Asma,

did you mean:

var R;
var V1;
var V2, binary;
st. contraint: R = (C1 + C3 * V1) / ( 1 - V2 * C2 );

Then this the problem of cause is not linear. But because V2
is binary you can replace the constraint by

st. contraint: R = V2 * (C1 + C3 * V1) / ( 1 - C2 )
                 + (1 - V2) * (C1 + C3 * V1);

Best regards

Xypron

-------- Original-Nachricht --------
> Datum: Wed, 23 Nov 2011 22:22:57 +0100
> Betreff: Re: [Help-glpk] operating following / has invalid

> Hi xypron,
> 
> But why do i have this error ? 
> What does this error mean?
> 
> When i looking for this error on thé internet, they say That error means
> is not possible devide one variable by anorther but it seems not true.
> 
> Regards 
> Asma
> Le 23 nov. 2011 à 21:46, Xypron <address@hidden> a écrit :
> 
> > Hello Asma,
> > 
> > R = (C1 + C3 * V1) / 1- (V2 * C2 )
> > is linear in R, V1, V2.
> > 
> > The model below is solved by glpsol.
> > 
> > Best regards
> > 
> > Xypron
> > 
> > param C1 := 1;
> > param C2 := 2;
> > param C3 := 3;
> > 
> > var R,  >= 0;
> > var V1, >= 0;
> > var V2, >= 0;
> > 
> > minimize obj : V1 + V2 + R;
> > s.t. c1: R = (C1 + C3 * V1) / 1- (V2 * C2);
> > end;
> > 
> > 
> > 
> > On 23.11.2011 17:10, esma mehiaoui wrote:
> >> 
> >> Hello,
> >>  
> >> I have this error: operating following / has invalid
> >>  
> >> The general form of my constraint it seems to: R = (C1 + C3 * V1) / 1-
> (V2 * C2 )
> >> where C1 , C2 and C3 are constants with C2 and C3 > 0.
> >> R and V1 is an reel variable.
> >> V2 is an binary variable.
> >>  
> >> Are there some solution to express this constraint ? (lenearize this
> constraint) 
> >> Best regards,
> >> Asma

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