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Re: [Help-glpk] Empty Sets

From: Andrew Makhorin
Subject: Re: [Help-glpk] Empty Sets
Date: Wed, 23 Feb 2011 21:47:51 +0300

> when I try to specify an empty set in the data file I cannot make it 
> work, though it is working in the above version:
> set S := {}; /* In the data file */
> obtaining: syntax error in set data block
> the other way round does not work either, i.e., defining an empty set in 
> the model and trying to override this in the data file.
> Whatever suggestion is appreciated.

You can declare the set as follows:

set S, default {};

In this case, if no value is given for S in the data section, the
default value (an empty set) will be used. For more details please see
the language reference.

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