<div dir="ltr">Got it - thanks! </div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 7, 2016 at 8:14 AM, Ipopt User <span dir="ltr"><<a href="mailto:ipoptuser@gmail.com" target="_blank">ipoptuser@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">IPOPT treats all constraints as equalities with slacks, see (2b) in <a href="http://www.optimization-online.org/DB_FILE/2004/03/836.pdf" target="_blank">http://www.optimization-<wbr>online.org/DB_FILE/2004/03/<wbr>836.pdf</a></div><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Tue, Sep 6, 2016 at 8:21 PM, Chunhua Men <span dir="ltr"><<a href="mailto:chhmen@gmail.com" target="_blank">chhmen@gmail.com</a>></span> wrote:<br></span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><div dir="ltr">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?<div><br></div><div>Thanks, Chunhua<br></div><div><div><br></div><div>      <br></div></div></div>
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