Java - MODEL_INVALID when I try to use addMultiplicationEquality with linear expressions

[Neil Aggarwal]

Hello all:

According to the docs, CpModel has this method:
addMultiplicationEquality(LinearArgument target,
LinearArgument left,
LinearArgument right)

So, I am supposed to be able to use IntVar and LiteralExpr in
the arguments.

But when I do, I am getting a MODEL_INVALID result.

I am attaching a sample class.

Any idea what is going wrong?

Thank you,
Neil

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Neil Aggarwal, (972) 834-1565, http://www.propfinancing.com
We offer 30 year loans on single family houses!

[Laurent Perron]

The java doc is lacking w.r.t. C++ and Python.

All linear expressions must be of the form a * var + b (1-var affine expression).

Furthermore, if you enable logging, you should see an explanatory error message.

Laurent Perron | Operations Research | lpe...@google.com | (33) 1 42 68 53 00

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[Neil Aggarwal]

> All linear expressions must be of the form a * var + b (1-var affine expression).

 

Ahhh, got it.  I updated my code to use IntVars for the terms and it works

now.  I am attaching the code in case someone else runs into this problem.