Re: [Help-glpk] How to make consecutive variables take a certain value?

[Oscar Gustafsson]

On Thu, 29 Nov 2007, Michael Hennebry wrote:
> Mathematically correct, but one should go for a tighter linear relaxation.
> x[d,h]<=x[d,h+1]
> x[d,h]<=x[d,h+2]
> With this formulation, the latter constraint is redundant.
> x[d,h]<=x[d,h+1] where d indexes a day and h and h+1 index hours.
Won't this force all the remaining hours of the day to be one?

On the other hand as the question is formulated it is supposedly what is 
going to happen.

My guess without knowing the context is that it might be better to imply 
the three our booking rule in the resource constraints instead of forcing 
the next two variables to be one, as this will lead to all preceeding 
variables to be one. An alternative might be to have two types of 
variables, one that considers the "original" one and one with variables 
that are one based on the original ones.

But considering it is 6:30 in the morning I may be really out of line 
here.

Regards

Oscar