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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.

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