RE: [Help-glpk] "0 or greater than" condition

[Meketon, Marc]

Andrew's right of course.  I wonder if adding additional constraints of 

  s.t. condition3{f in FOO, b in BAR, a in BAZ} :
      x[f,b,a] <= u[f,b,a] * z;

would help in developing an integer solution faster?

-----Original Message-----
From: Andrew Makhorin [mailto:address@hidden 
Sent: Saturday, March 22, 2008 1:05 PM
To: Meketon, Marc
Cc: JohannesJ; address@hidden
Subject: Re: [Help-glpk] "0 or greater than" condition

> Probably correct formulation should be the following:
> 
> s.t. condition1{f in FOO, b in BAR}:
>         sum{a in BAZ} x[f,b,a] >= 5 * z;
> 
> s.t. condition2{f in FOO, b in BAR}:
>         sum{a in BAZ} x[f,b,a] <= u[f,b,a] * z;
> 
> where u[f,b,a] is an upper bound of x[f,b,a].

The second constraint should be the following:

s.t. condition2{f in FOO, b in BAR}:
        sum{a in BAZ} x[f,b,a] <= u[f,b] * z;

where u[f,b] is an upper bound of sum{a in BAZ} x[f,b,a].



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