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## Re: [Help-glpk] Tricky constraint formulation

**From**: |
Andrew Makhorin |

**Subject**: |
Re: [Help-glpk] Tricky constraint formulation |

**Date**: |
Wed, 09 Mar 2011 18:47:47 +0300 |

On Wed, 2011-03-09 at 18:43 +0300, Andrew Makhorin wrote:
>* On Wed, 2011-03-09 at 06:30 -0800, teitifeiti wrote:*
>* > Hello everyone. *
>* > *
>* > I have a problem in formulating a constraint. The constraint is:*
>* > C[r,i] - C[r,k] + P*D[i,k] >= T[r,i] where (1 <= r <= M ; 1 <= i < k*
>* > <= N);*
>* > *
>* > So what I tried first was: *
>* > *
>* > s.t. constraint{r in 1..R,i 1..I,k in 1..I}*
>* > *
>* > But that constraint holds for all k < i, which I don't want it to do. *
>* > *
>* > Does anyone have a cool solution to my problem??*
>* > *
>* > Respectfully, TeitiFeiti*
>* *
>* s.t. constraint{r in 1..R,i 1..I,k in 1..I: i < k} ...*
>* *
The following is more efficient:
s.t. constraint{r in 1..R,i 1..I,k in i+1..I} ...