<div dir="ltr"><div>I forgot to say that I already do so :)</div><div><br></div><div>Thank you anyway.</div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-01-19 14:52 GMT+00:00 Stefan Vigerske <span dir="ltr"><<a href="mailto:stefan@math.hu-berlin.de" target="_blank">stefan@math.hu-berlin.de</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Maybe enabling start_with_resto could help:<br>
<a href="https://www.coin-or.org/Ipopt/documentation/node50.html#SECTION0001110040000000000000" target="_blank" rel="noreferrer">https://www.coin-or.org/Ipopt/<wbr>documentation/node50.html#SECT<wbr>ION0001110040000000000000</a><span><br>
<br>
On 01/19/2017 12:48 PM, Martin Neuenhofen wrote:<br>
</span><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><span>
Dear community,<br>
<br>
I observe that the solver does not try to achieve feasibility as long as an<br>
improvement in the cost function can be made. However, at some point I want<br>
so say "I am happy without optimality in the 10th digit of my cost<br>
function, so now stop and make it feasible.".<br>
So what I tried first of all was the option<br>
options.ipopt.acceptable_obj_c<wbr>hange_tol = 1 and hoped the solver would<br>
directly from the first iter only go for feasibility in order to stop as<br>
soon as possible. However, it still solves until a few dozens of iterations<br>
and only eventually decreases the primal infeasibility.<br>
<br>
So my questions are:<br>
<br></span>
- May it be that the option acceptable_obj_change_tol does not have any<span><br>
effect at all in Matlab Ipopt 3.12.3 ?<br></span>
- How can I force Ipopt into only finding a feasible point from my<span><br>
current guess as quickly as possible without increasing the current cost<br>
function value? So I want to do early what Ipopt would do in the few very<br>
last iterations where it refines the feasibility.<br>
<br>
Cheers,<br>
Martin<br>
<br>
<br>
<br></span>
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</font></span></blockquote><span class="HOEnZb"><font color="#888888">
<br>
<br>
-- <br>
<a href="http://www.gams.com/~stefan" target="_blank" rel="noreferrer">http://www.gams.com/~stefan</a><br>
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