<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear Ted,<div class=""><br class=""></div><div class="">Thank you for your answer! I opened a corresponding issue on the GitHub repository.</div><div class=""><br class=""></div><div class="">Best<br class=""><div class="">
<div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">--<br class="">Simone Zaccaria<br class="">Postdoctoral Research Associate<br class="">Raphael Lab, Computer Science Department<br class="">Princeton University<br class="">Princeton, NJ 08540</div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On Mar 15, 2019, at 3:58 PM, Ted Ralphs <<a href="mailto:ted@lehigh.edu" class="">ted@lehigh.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div dir="ltr" class="">Hi Simone,<div class=""><br class=""></div><div class="">I'm the nominal maintainer of FlopC++, although I did not write it and haven't used it extensively. The original I sort of inherited maintenance of it by default and have been fixing things here and there. As far as I know, FlopC++ does not support warm-starting, but I guess it shouldn't be very difficult to add. I can try to take a look, but to keep track of your request, could you open an issue on the GitHub page for the project:</div><div class=""><br class=""></div><div class=""><a href="https://github.com/coin-or/FlopCpp" class="">https://github.com/coin-or/FlopCpp</a></div><div class=""><br class=""></div><div class="">We're in the process of migrating over to Github, but we'll deal with issues there going forward.</div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">Ted</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Mar 15, 2019 at 2:52 PM Simone Zaccaria <<a href="mailto:zaccaria@princeton.edu" class="">zaccaria@princeton.edu</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear authors,<br class="">
<br class="">
We have a C++11 program, designed in my research lab at Princeton University, which is currently using Gurobi to solve several MILP formulations in parallel. Now, I need to replace Gurobi with an open-source MILP solver with less restrictive license options, available also for non-commercial research entities other than universities. I explored several options (GLPK, Coin-OR CBC, SCIP...) but I need to maintain the simplicity of the Gurobi interface (an algebraic like interface).<br class="">
<br class="">
As such, I am looking for an open source C++11 modeling language or MILP solver with a C++11 API with the following 2 requirements:<br class="">
1. Algebraic-like style of programming (e.g. add_constraint(x1 + x2 >= x3))<br class="">
2. Possibility to specify WARM STARTS (also called, hot starts, MIP starts, or initial solutions) which are basically an initial solution for the variables where to start the optimization<br class="">
Your FLOC++ package seems a very good option for this, however I was not able to understand whether condition 2. is met. Also I would like to know if there are some available examples.<br class="">
<br class="">
Thank you,<br class="">
Best regards<br class="">
--<br class="">
Simone Zaccaria<br class="">
Postdoctoral Research Associate<br class="">
Raphael Lab, Computer Science Department<br class="">
Princeton University<br class="">
Princeton, NJ 08540<br class="">
<br class="">
<br class="">
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</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class="">Dr. Ted Ralphs<br class="">Professor, Industrial and Systems Engineering<br class="">Lehigh University<br class="">(610) 628-1280<br class="">ted 'at' lehigh 'dot' edu<br class=""><a href="http://coral.ie.lehigh.edu/~ted" target="_blank" class="">coral.ie.lehigh.edu/~ted</a><br class=""></div></div></div></div></div></div></div></div>
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