Zvonko,
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
Em 01/10/2014 08:31, Zvonko Bregar escreveu:
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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