you may use binary variables to solve this problem, but, x must have a upper bound.
For example, suppose x <= 10 and x \in \{2,4,6,8,10 \}, then define a binary variable
Y_j = 1 , if x = 2*j or 0, otherwise for j = 1,2,3,4,5
Therefore, x = 2*y_1 + 4*y_2 + 6*y_3 + 8*y_4 + 10*y_5
y_1 + y_2 + y_3 + y_4 + y_5 = 1
I hope this helps.
Antonio
Hi everybody,
Does there exist an _expression_
That forces
An integer variable X \in { 1, 2, 3, …}
To take the values only from even numbers
X \in {2, 4, 6, …}
Regards,
--Zvonko
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