<br><font size=2 face="sans-serif">It is not an error in MPS output but
an error (been there for several years) on converting a network matrix
to a standard CoinPackedMatrix format. In Clp every matrix type must
be able to return a matrix as a CoinPackedMatrix. With a network
matrix doing MPS output was the most likely time to do this - but somehow
it had never been tested.</font>
<br>
<br><font size=2 face="sans-serif">Seems to be fixed now.</font>
<br>
<br><font size=2 face="sans-serif">Thanks for finding the bug.</font>
<br>
<br><font size=2 face="sans-serif">John Forrest</font>
<br>
<br>
<br>
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<td width=40%><font size=1 face="sans-serif"><b>"Lijian Chen"
<lijian.chen@louisville.edu></b> </font>
<br><font size=1 face="sans-serif">Sent by: coin-lpsolver-bounces@list.coin-or.org</font>
<p><font size=1 face="sans-serif">02/27/2007 05:47 PM</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif"><coin-lpsolver@list.coin-or.org></font>
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<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
<td>
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<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">[Coin-lpsolver] MPS output problem detected</font></table>
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<br><tt><font size=2>Dear Folks,<br>
<br>
I realized there might be an issue discovered by my experience.<br>
<br>
Since I am a newbie moving to open source code, I use examples to gain
experience. What I did was<br>
<br>
add "#include<CoinMpsIO.hpp>" into the source code of network.cpp<br>
<br>
add "model.writeMps("test.mps");" into the body of
network.cpp<br>
<br>
Then I use "make DRIVER=network" to build the binary.<br>
<br>
Till now, everything is fine. I want to use my old friend, xpress_MP to
test the solution. It takes more than a hour to analyze infeasibility.
I ran out of patience and I try to use Clp to test mps file. <br>
<br>
However, when I input the "./clp test.mps", I got the following
error message,<br>
<br>
Coin LP version 1.03.03, build Feb 8 2007<br>
command line - ./clp /home/lijian/success/workspace/birge_book/test.mps<br>
At line 1 NAME BLANK<br>
At line 2 ROWS<br>
At line 5004 COLUMNS<br>
Duplicate row R0000223 at line 26280 < C0010637 R0000223
-1. ><br>
At line 30005 RHS<br>
At line 30506 BOUNDS<br>
At line 43007 ENDATA<br>
Problem BLANK has 5000 rows, 12500 columns and 24999 elements<br>
There were 1 errors when importing model from /home/lijian/success/workspace/birge_book/test.mps<br>
There were 1 errors on input<br>
<br>
Can anyone tell me why? I am working on research of stochastic programming.
I want to make sure my code would reflect my algorithm accurately. Thanks!<br>
<br>
<br>
Lijian Chen<br>
<br>
Assistant Professor<br>
J.B. Speed School of Engineering<br>
Department of Industrial Engineering<br>
University of Louisville<br>
(Tel) 502-852-2197<br>
(Fax) 502-852-5633<br>
<br>
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</font></tt>
<br>