[Ipopt] Negative Lagrange multipliers?

[Chunhua Men]

Hi, I used IPOPT 3.12.4 to solve a constrained model, and chose
"limited-memory" as the Hessian approximation. My coding environment is
visual studio C++.  IPOPT converged to optimal solution.  I wanted to know
the Lagrange multiplier for each constraint, so I printed out "lambda" in
"finalize_solution". However, many of them were negative. Did I miss
anything?

Thanks, Chunhua
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