<div dir="ltr"><div>@ John:</div><div>Thanks for your answer.</div><div>Is there a function to save the mipstart (as getMIPStart doesn't seem to do it)? And do you have an example about mipstart?</div><div>The event handler works perfectly btw! :) Thanks.</div><div><br></div><div>@ Ted, Babak: thank you too!</div><div><br></div><div>Btw, can anybody tell me is the precise difference is between</div><div>- hotstart</div><div>- warmstart</div><div>- resolve </div><div>- mipstart?</div><div><br></div><div>Kind regards,</div><div>Mona</div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Nov 7, 2015 at 3:46 PM, John Forrest <span dir="ltr"><<a href="mailto:john.forrest@fastercoin.com" target="_blank">john.forrest@fastercoin.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>Mona,<span><br>
<br>
On 06/11/15 13:45, Mona Rahn wrote:<br>
</span></div><span>
<blockquote type="cite">
<div dir="ltr">
<div>Hi!<br>
</div>
<div><br>
</div>
<div>I have three questions:</div>
<div><br>
</div>
<div>1) I am pretty new in using CBC with C++. Do you have a tip
on a good way to start, i.e. a documentation / tutorial /
handbook for beginners? Most of the stuff I found online was
aimed at a much higher level of knowledge. The documentation
link that can be found on the COIN-OR website (<a href="https://projects.coin-or.org/Cbc" target="_blank"></a><a href="https://projects.coin-or.org/Cbc" target="_blank">https://projects.coin-or.org/Cbc</a>
at the bottom) doesn't work.</div>
<div><br>
</div>
</div>
</blockquote></span>
Documentation has never been the strong point of Cbc. It can be
useful to invoke cbc and try ? and then look at individual options -
see 2)<span><br>
<br>
<blockquote type="cite">
<div dir="ltr">
<div>2) I have an minimization LP that I resolve several times
with different objectives. That is, I solve it, upper bound
the unique variable appearing in my first objective function
to the calculated value, and set another variable as my
objective.</div>
<div>Now, my question is: The solver appears to start from
scratch every time I call it, but I would like to keep the old
solution and start from there. Is there a way to do this? I
have seen the warm start in OsiCbcSolverinterface, but I am
not sure how to use it.</div>
<div><br>
</div>
</div>
</blockquote>
<br></span>
If you do cbc and then mipstart?? you will see that you can save the
solution from one run and then use it as an input solution to next.<span><br>
<blockquote type="cite">
<div dir="ltr">
<div>3) I would like to have set a time limit that only stops
the program if there is already a solution found (which isn't
necessarily optimal), but not if it is still searching for a
solution. The only time limit I have found is
CbcModel::setMaximumSeconds, but this stops the program no
matter what. Do you have a solution for this?</div>
<div><br>
</div>
</div>
</blockquote>
<br></span>
You may wish to use the drivers that allow you to call cbc as normal
but with changes. Look at driver6.cpp. If you have a driver like
that then you could check if you have a solution and then stop on
time. I would suggest modifying MyEventHandler3::event to check if
event was treeStatus and solution found and too many seconds.<span><font color="#888888"><br>
<br>
John Forrest<br>
</font></span><blockquote type="cite"><span>
<div dir="ltr">
<div>Thanks a lot in advance.</div>
<div><br>
</div>
<div>Kind regards,</div>
<div>Mona</div>
</div>
<br>
<fieldset></fieldset>
<br>
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</span></blockquote>
<br>
</div>
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