<br><font size=2 face="sans-serif">Looking OsiCpx it looks as if it sets
coltype_ in OsiCpx correctly but if it is not a MIP in Cplex does not tell
Cplex. Using writeMpsNative should work.</font>
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<td width=40%><font size=1 face="sans-serif"><b>"Spencer Fung"
<sklfung@cse.cuhk.edu.hk></b> </font>
<br><font size=1 face="sans-serif">Sent by: coin-discuss-bounces@list.coin-or.org</font>
<p><font size=1 face="sans-serif">03/18/2005 12:09 PM</font>
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<div align=center><font size=1 face="sans-serif">Please respond to<br>
Discussions about open source software for Operations Research
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td valign=top><font size=1 face="sans-serif">"'Discussions about
open source software for Operations Research'" <coin-discuss@list.coin-or.org></font>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td valign=top><font size=1 face="sans-serif">RE: [Coin-discuss] Construct
a MIP problem</font></table>
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<br><font size=1 color=#000080 face="Arial">John,</font>
<br><font size=1 color=#000080 face="Arial"> </font>
<br><font size=1 color=#000080 face="Arial">But I am using CPLEX, can it
be done the same?</font>
<br><font size=1 color=#000080 face="Arial"> </font>
<br><font size=1 color=#000080 face="Arial">Spencer</font>
<br><font size=1 color=#000080 face="Arial"> </font>
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<br><font size=2 face="Tahoma"><b>From:</b> coin-discuss-bounces@list.coin-or.org
[mailto:coin-discuss-bounces@list.coin-or.org] <b>On Behalf Of </b>John
J Forrest<b><br>
Sent:</b> Saturday, March 19, 2005 1:01 AM<b><br>
To:</b> Discussions about open source software for Operations Research<b><br>
Subject:</b> Re: [Coin-discuss] Construct a MIP problem</font>
<br><font size=3 face="Times New Roman"> </font>
<br><font size=2 face="sans-serif"><br>
Spencer,</font><font size=3 face="Times New Roman"> <br>
</font><font size=2 face="sans-serif"><br>
It should work (well if you are using Clp). I have modified the OsiClp
unitTest to show that. The extra code is lines 941 to 950 of OsiClpSolverInterfaceTest.cpp.</font><font size=3 face="Times New Roman">
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</font><font size=2 face="sans-serif"><br>
If you make unitTest in COIN/Osi and run unitTest you should see two mps
files "continuous" and "integer". You will see
that the continuous bounds are all UP while the integer bounds are BV.</font><font size=3 face="Times New Roman">
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</font><font size=2 face="sans-serif"><br>
John Forrest</font><font size=3 face="Times New Roman"> <br>
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<td width=60%><font size=1 face="sans-serif"><b>"Spencer Fung"
<sklfung@cse.cuhk.edu.hk></b> <br>
Sent by: coin-discuss-bounces@list.coin-or.org</font><font size=3 face="Times New Roman">
</font>
<p><font size=1 face="sans-serif">03/17/2005 01:32 PM</font><font size=3 face="Times New Roman">
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td valign=top><font size=1 face="sans-serif">[Coin-discuss] Construct
a MIP problem</font></table>
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Hi All,</font><font size=3 face="Times New Roman"> </font><font size=1 face="Arial"><br>
</font><font size=3 face="Times New Roman"> </font><font size=1 face="Arial"><br>
I am wondering how to construct a MIP problem by using constraint matrix.
I have done the following procedure to create a MIP problem, <br>
</font><font size=3 face="Times New Roman"> </font><font size=1 face="Arial"><br>
si->loadProblem(*matrix, NULL, col_ub, NULL, sense, rhs,
NULL);</font><font size=3 face="Times New Roman"> </font><font size=1 face="Arial"><br>
si->setInteger(ctype, n_cols);</font><font size=3 face="Times New Roman">
</font><font size=1 face="Arial"><br>
si->writeMps("problem");</font><font size=3 face="Times New Roman">
</font><font size=1 face="Arial"><br>
</font><font size=3 face="Times New Roman"> </font><font size=1 face="Arial"><br>
However, the column type show in “problem.mps” is still continuous. But
after invoke the branchAndBound(), the column type is changed to integer.
Is it possible to obtain an integer model before invoking the B&B?</font><font size=3 face="Times New Roman">
</font><font size=1 face="Arial"><br>
</font><font size=3 face="Times New Roman"> </font><font size=1 face="Arial"><br>
Thanks.</font><font size=3 face="Times New Roman"> </font><font size=1 face="Arial"><br>
</font><font size=3 face="Times New Roman"> </font><font size=1 face="Arial"><br>
Cheers,</font><font size=3 face="Times New Roman"> </font><font size=1 face="Arial"><br>
Spencer</font><font size=2 face="Courier New">_______________________________________________<br>
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