Example code for Python-bindings of the Pack() constraint ?

[Dirk Schroetter]

Folks,

I was wondering if someone had shareable example code for the Python bindings of the Pack() API.

I have studied the "steel" examples in the examples directory, but fail to translate my model into what I am looking for.

The idea is that I have a number of capacitated demands that should be packed into a number of bins (of different capacities). The number of bins is fixed and the demands for a set of bins is stored in a BoolVar array.

Any pointers greatly appreciated.

Best Regards,

/Dirk

[Laurent Perron]

Hello, 

If you already have the bool variables, you don't need the pack constraint.

Just add the correct for all bins j, sum(bi * size_i < capacity_j)

and you would be fine.

The pack constraints is here mostly to gain space and share the same boolean variables and propagation events on those variables internally. There is no fancy propagation.

--Laurent

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--Laurent

[Dirk Schroetter]

Thanks Laurent,

worked around it as you suggested and works perfectly.

Best Regards,

/Dirk