<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 Tim,<div class=""><br class=""></div><div class="">Thank you very much for the reference! Unfortunately I am not sure from that example where the initial feasible solution is specified; could you help me with this?</div><div class=""><br class=""></div><div class="">Thanks,</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 16, 2019, at 12:29 PM, Tim Hultberg <<a href="mailto:Tim.Hultberg@eumetsat.int" class="">Tim.Hultberg@eumetsat.int</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="margin-top: 0px; margin-bottom: 0px; caret-color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class="">Dear Simone,</div><div style="margin-top: 0px; margin-bottom: 0px; caret-color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px; caret-color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class="">Have a look at the<span class="js-path-segment"><a data-pjax="true" href="https://github.com/coin-or/FlopCpp/tree/master/FlopCpp" class=""><span class=""> FlopCpp</span></a></span><span class="separator">/</span><span class="js-path-segment"><a data-pjax="true" href="https://github.com/coin-or/FlopCpp/tree/master/FlopCpp/examples" class=""><span class="">examples</span></a></span><span class="separator">/</span><span class="final-path"><strong class="">stochbenders.cpp<span class="Apple-converted-space"> </span></strong>example, which uses the resolve method of the underlying solver interface.<br class=""></span></div><div style="margin-top: 0px; margin-bottom: 0px; caret-color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span class="final-path"><br class=""></span></div><div style="margin-top: 0px; margin-bottom: 0px; caret-color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span class="final-path">Cheers, Tim<br class=""></span></div><div style="margin-top: 0px; margin-bottom: 0px; caret-color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span class="final-path"></span><br class=""></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; 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; background-color: rgb(255, 255, 255); text-decoration: none; color: rgb(33, 33, 33);" class=""><hr tabindex="-1" style="display: inline-block; width: 1294.578125px;" class=""><div id="divRplyFwdMsg" dir="ltr" class=""><font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>FlopCpp <<a href="mailto:flopcpp-bounces@coin-or.org" class="">flopcpp-bounces@coin-or.org</a>> on behalf of Ted Ralphs <<a href="mailto:ted@lehigh.edu" class="">ted@lehigh.edu</a>><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>15 March 2019 20:58<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>Simone Zaccaria<br class=""><b class="">Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:mail=flopcpp@list.coin-or.org" class="">mail=flopcpp@list.coin-or.org</a><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [FlopCpp] Availability of warm starts and examples</font><div class=""> </div></div><div 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://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_coin-2Dor_FlopCpp&d=DwMFaQ&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=Z_vAP52Ad0q2k_P9g-qnFxc4msjNuX2kAmjL74eSbEQ&m=Adu16uhNYXoP-c1Hhdew0-jLPJhCAzjWLSYZVeRJTxI&s=r1Ar5G9x_MmFnAFodrCIPGmypLsOlzVBiLYPLIiywkw&e=" 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-width: 1px; border-left-style: solid; border-left-color: 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="">_______________________________________________<br class="">FlopCpp mailing list<br class=""><a href="mailto:FlopCpp@list.coin-or.org" target="_blank" class="">FlopCpp@list.coin-or.org</a><br class=""><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__list.coin-2Dor.org_mailman_listinfo_flopcpp&d=DwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=rgmzeitoi_JLsKZVuhLlfU_msN8xdTJ2mHeJJLFQb9E&s=l0NSF6svBO1Aeo-BxsRKiGQMcs6-mZwgtLGmXeqKGWk&e=" rel="noreferrer" target="_blank" class="">https://urldefense.proofpoint.com/v2/url?u=https-3A__list.coin-2Dor.org_mailman_listinfo_flopcpp&d=DwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=rgmzeitoi_JLsKZVuhLlfU_msN8xdTJ2mHeJJLFQb9E&s=l0NSF6svBO1Aeo-BxsRKiGQMcs6-mZwgtLGmXeqKGWk&e=</a><br class=""></blockquote></div><br clear="all" class=""><div class=""><br class=""></div>--<span class="Apple-converted-space"> </span><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="https://urldefense.proofpoint.com/v2/url?u=http-3A__coral.ie.lehigh.edu_-7Eted&d=DwMFaQ&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=Z_vAP52Ad0q2k_P9g-qnFxc4msjNuX2kAmjL74eSbEQ&m=Adu16uhNYXoP-c1Hhdew0-jLPJhCAzjWLSYZVeRJTxI&s=bxc-rGHE_f6b1zXezWk2Aj5aQtRJJS35F1G6TqzNXI8&e=" target="_blank" class="">coral.ie.lehigh.edu/~ted</a><br class=""></div></div></div></div></div></div></div></div></div></div><br clear="both" style="caret-color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">Any email message from EUMETSAT is sent in good faith but shall neither be binding nor construed as constituting a commitment by EUMETSAT, except where provided for in a written agreement or contract or if explicitly stated in the email. 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