<div dir="ltr">If you don't want to modify any source code, I think the easiest way is to increase the log level.</div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 7, 2016 at 11:49 AM, Chunhua Men <span dir="ltr"><<a href="mailto:chhmen@gmail.com" target="_blank">chhmen@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">BTW, is it possible to know Lagrange multipliers for each iteration (instead of at the end of optimization)? Since I use "limited-memory" as the Hessian approximation, the "eval_h" is not used, then I could not get Lagrange-multipliers updates during optimization process.<div><br></div><div>Thanks again, Chunhua </div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 7, 2016 at 8:42 AM, Chunhua Men <span dir="ltr"><<a href="mailto:chhmen@gmail.com" target="_blank">chhmen@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">Got it - thanks! </div><div class="gmail_extra"><br><div class="gmail_quote"><span>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></span><div><div><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-onl<wbr>ine.org/DB_FILE/2004/03/836.pd<wbr>f</a></div><div class="gmail_extra"><br><div class="gmail_quote"><span>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><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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