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## Re: [Help-glpk] [Fwd: [Fwd: Re: Initializing a few decision variables]]

**From**: |
Andrew Makhorin |

**Subject**: |
Re: [Help-glpk] [Fwd: [Fwd: Re: Initializing a few decision variables]] |

**Date**: |
Mon, 01 Aug 2011 21:50:32 +0400 |

>* I added two arrays of equal dimensions to the set, FT and FS, and*
>* initialized them in the data section*
>* They hold the paired values for the initial assignments.*
>* set FT := D1 B2 D2 B3 B1;*
>* set FS := 1 2 4 5 7;*
>* *
>* I added the following statement to the model*
>* *
>* s.t. init{f in FT,}: x[f,FS[f]] = 1;*
>* *
>* the error is that FS cannot be subscripted.*
>* *
>* Basic question remains on how to specify the initial assignment constraint*
>* in the model section*
>* and how to specify the pairs of initial assigments in the data section.*
In the model section:
set F, dimen 2;
s.t. init{(i,j) in F}: x[i,j] = 1;
In the data section:
set F := D1 1, B2 2, D2 4, B3 5, B1 7;
Please see also examples included in glpk distribution.