Re: [Help-glpk] [Fwd: Conditional objective function structure]

[glpk xypron]

Hello Dong-John,

your message had to be forwarded manually because you are not subscribed to the 
list, see
https://lists.gnu.org/mailman/listinfo/help-glpk

I guess this is what you are looking for:

param flag := 2;
var x1, >= 0, <= 3;
var x2, >= 0, <= 4;
maximize obj :
  ( if flag == 1 then  .3 * x1 + .4 * x2 else 0 ) +
  ( if flag == 2 then  .5 * x1 + .3 * x2 else 0 ) +
  ( if flag == 3 then -.3 * x1 - .4 * x2 else 0 );
s.t. c1 : x1 + x2 <= 5;
solve;
end;

Best regards

Xypron

> -------- Forwarded Message --------
> Subject: Conditional objective function structure
> Date: Wed, 8 Feb 2012 21:23:31 -0800
> 
> Hello,
> 
> Can I make a code structure like following,,?
> 
> (if flag = 1 then
>  (
>   minimize ~~
>   s.t. ~~
>  )
>  else if flag = 2 then
>  (
>   maximize ~~
>   s.t. ~~
>  )
>  else
>  (
>    ~~
>  )
> );
> 
> solve;
> 
> Best,
> TGno3

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