TypeError: list indices must be integers or slices, not VariableInteger

[jarandaf]

I am trying to reproduce the Warehouse Location problem shown in the docs. I am getting the title error as soon as I use the variable w for indexing:

minimize(
    # minimizing the cost of supplying stores
    Sum(costs[i][w[i]] for i in range(nStores))
);

Any hints?

[jarandaf]

I managed to make it work by wrapping the list of costs with pycsp3.tools.curser.ListInt. I take the opportunity to ask if float is a supported type when minimizing/maximizing an objective.

[xcsp3team]

Hi,

indeed, when data are directly given in the code (and not loaded from a file),
you may need to get the right type for lists of integers (and lists of variables)
by calling cp_array as in:
costs = cp_array(costs)

For the moment, float is not supported (but it may be the case in the future).

[jarandaf]

Thank you for the quick answer.