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| From: | Andrew Makhorin |
| Subject: | Re: [Help-glpk] Different constraint for first element of a set than for other elements |
| Date: | Tue, 2 Feb 2010 02:55:44 +0300 |
> The model has a different constraint for the first
> element of a set (say PERIODS) than for all remaining elements.
> I have defined three sets:
> INITIAL_PERIOD;
> OTHER_PERIODS;
> PERIODS := INITIAL_PERIOD union OTHER_PERIODS;
> when MathProg is generating the model and specifically constraints over
> the PERIODS set it terminates with the following error
> cannot convert JAN to floating-point number
> where JAN is the first period in OTHER_PERIODS
Probably you attempt to assign a symbolic value ('JAN') to a numeric
parameter.
> How should the model be written in MathProg to allow different
> constraints for the first element.
You may write one constraint for the first element and other constraint
for elements other the first one.
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