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## Re: [Help-glpk] How to use a subset of a set as a variable in GLPK

**From**: |
Andrew Makhorin |

**Subject**: |
Re: [Help-glpk] How to use a subset of a set as a variable in GLPK |

**Date**: |
Sat, 29 Jul 2017 17:04:28 +0300 |

>* So say I have this set where I only have a certain dates where I want*
>* to add more items and after a certain date remove those items.*
>* *
>* How would approach this if I have this to start with:*
Your question is unclear. Please explain in more details what you need
to model.
>* *
>* # set of points*
>* *
>* *
>* set I;*
>* *
>* param x {i in I};*
>* *
>* param y {i in I};*
>* *
>* printf {i in I} "%.2f, %.2f, %.2f\n", i, x[i],y[i];*
>* *
>* data;*
>* *
>* param : I : x y :=*
>* *
>* 4.01 0 1*
>* *
>* 4.02 0.5 0.9*
>* *
>* 4.03 1 0.7*
>* *
>* 4.04 1.5 1.5*
>* *
>* 4.05 1.9 2*
>* *
>* 4.06 2.5 2.4*
>* *
>* 4.07 3 3.2*
>* *
>* 4.08 3.5 2*
>* *
>* 4.09 4 2.7*
>* *
>* ;*
>* end;*
>* *

**Re: [Help-glpk] How to use a subset of a set as a variable in GLPK**,
*Andrew Makhorin* **<=**