[Coin-ipopt] How to couple variables in Ipopt without reformulation

[Su Ba]

Hi all,

I need to modify my current optimization problem by posing some constraints 
of coupling variables:

max f(x)                         max f(x)
s.t.                                s.t.
  c(x)=0                  =>    c(x)=0
  x_U <= x <= x_L           x_i =x_j  (still unknowns)
                                                   i = 1,3,5 j=2,4,6 for 
example
                                      x_L <= x <= x_U

Is there any way to express these additional equalities without 
reformulation of the optimization problem?

Thank you very much.

Cheers.

Danh

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