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<p>I tested the default version, i.e. the one using Pisinger's
algorithm to solve the knapsack sub-problems.<br>
</p>
<p>Decomposition techniques should work rather well for GAP. For
example:
<a class="moz-txt-link-freetext" href="http://www.optimization-online.org/DB_FILE/2004/11/990.pdf">http://www.optimization-online.org/DB_FILE/2004/11/990.pdf</a><br>
</p>
<p>Furthermore, isn't the PC relaxation supposed to be at least as
good as the linear relaxation? I though it was even supposed to be
equal to the bound from the Lagrangian relaxation of the
assignment constraints. I've implemented on my own the Lagrangian
relaxation of the assignment constraints that I solved with Vol
from COIN-OR, and it finds a lower bound of 1698 in 0.02s for
instance a05100. And I'm sure that the problems are exactly the
same.</p>
<p>For the 1693 with doCut=1, it really seems to me that it may come
from the non-implementation of the knapsack constraints in
GAP_DecompApp.cpp</p>
<p> setModelRelax(NULL, modelName, i);</p>
<p>I don't know if there's a reason why they are not added here
whereas they are in GAP_DecompApp3.cpp</p>
<p>Florian<br>
</p>
<div class="moz-cite-prefix">Le 12/06/2019 à 22:23, Matthew Galati a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAMjmidyWitmsiRy7SfrXAnX526kuEATqwdtMPW2kgoCnd5n1Qg@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Sure that can happen. It just means that the PC
relaxation is too weak and that is a bad way to solve the
problem. Is that with the KP oracle or the AP oracle? I would
expect the bound using the KP oracle to be strong.
<div><br>
</div>
<div>If you get 1693 with doDirect or doCut but 1698 with CBC,
then either (a) there is a bug, or (b) you are not creating
the same model.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Jun 12, 2019 at 4:14
PM Florian Fontan <<a href="mailto:dev@florian-fontan.fr"
moz-do-not-send="true">dev@florian-fontan.fr</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Indeed! I didn't think to look there.</p>
<p>I managed to compile the GAP example. I tested on
instance a05100. This instance is solved optimally by a
naive implementation in CBC in 0.005s. The optimal value
is 1698 which is actually also the upper bound from the
linear relaxation. When I try the GAP implementation given
as example in Dip on this instance (./decomp_gap --param
gap.parm)</p>
<ul>
<li>with doPriceCut = 1, doCut = 0, doDirect = 0: the
lower bound found is 1556, no feasible solution is found
and the algorithm doesn't terminate after at least
several minutes</li>
<li>with doPriceCut = 0, doCut = 1, doDirect = 0 or
doDirect = 1: the algorithm terminates very quickly,
returning a best lower bound and a best upper bound of
1693. I think it may be the solution of the problem with
the capacity constraints removed.</li>
</ul>
<p>Is this the expected behavior?</p>
<p>Florian<br>
</p>
<div class="gmail-m_-6113883389000557119moz-cite-prefix">Le
11/06/2019 à 22:34, Matthew Galati a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">The Makefile gives some hints... one case
using the built-in MILP solver, one case uses a KP
solver.
<div><br>
</div>
<div>
<table
class="gmail-m_-6113883389000557119gmail-highlight
gmail-m_-6113883389000557119gmail-tab-size
gmail-m_-6113883389000557119gmail-js-file-line-container">
<tbody style="box-sizing:border-box">
<tr style="box-sizing:border-box">
<td id="gmail-m_-6113883389000557119gmail-LC25" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap">
<table class="gmail-m_-6113883389000557119gmail-highlight gmail-m_-6113883389000557119gmail-tab-size gmail-m_-6113883389000557119gmail-js-file-line-container" style="box-sizing:border-box;border-collapse:collapse;border-spacing:0px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";font-size:14px;white-space:normal"><tbody style="box-sizing:border-box"><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L25" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC25" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span>PC: oracle for KP solve is Pisinger, BranchEnforceInMaster</span></td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L26" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC26" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-smi" style="box-sizing:border-box">OBJS</span> += GAP_DecompApp.@OBJEXT@</td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L27" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC27" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-smi" style="box-sizing:border-box">CFLAGS</span> = -DVERSION1</td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L28" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC28" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap">
</td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L29" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC29" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span>TODO: BranchEnforceInSubProb using GAP_DecompApp2 or by option</span></td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L30" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC30" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap">
</td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L31" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC31" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span> CPM/PC: built-in MILP solver, dense model build</span></td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L32" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC32" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span> BranchEnforceInMaster or BranchEnforceInSubProb by option</span></td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L33" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC33" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span>OBJS += GAP_DecompApp3.@OBJEXT@</span></td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L34" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC34" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span>CFLAGS += -DVERSION3</span></td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L35" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC35" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap">
</td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L36" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC36" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span> CPM/PC: built-in MILP solver, sparse model build</span></td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L37" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC37" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span> BranchEnforceInMaster or BranchEnforceInSubProb by option</span></td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L38" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC38" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span>OBJS += GAP_DecompApp4.@OBJEXT@</span></td></tr><tr style="box-sizing:border-box"><td id="gmail-m_-6113883389000557119gmail-L39" class="gmail-m_-6113883389000557119gmail-blob-num gmail-m_-6113883389000557119gmail-js-line-number" style="box-sizing:border-box;padding:0px 10px;color:rgba(27,31,35,0.3);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;line-height:20px;min-width:50px;text-align:right;vertical-align:top;white-space:nowrap;width:50px">
</td><td id="gmail-m_-6113883389000557119gmail-LC39" class="gmail-m_-6113883389000557119gmail-blob-code gmail-m_-6113883389000557119gmail-blob-code-inner gmail-m_-6113883389000557119gmail-js-file-line" style="box-sizing:border-box;padding:0px 10px;line-height:20px;vertical-align:top;font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;overflow:visible;white-space:pre-wrap"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box;color:rgb(106,115,125)"><span class="gmail-m_-6113883389000557119gmail-pl-c" style="box-sizing:border-box">#</span>CFLAGS += -DVERSION4</span></td></tr></tbody></table>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Jun 11, 2019
at 3:41 PM Florian Fontan <<a
href="mailto:dev@florian-fontan.fr" target="_blank"
moz-do-not-send="true">dev@florian-fontan.fr</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Dear Dip community,<br>
<br>
I am trying to get familiar with Dip and understand
how it works. Could <br>
someone tell me the differences between the multiple
DecompApp <br>
implementation examples for the Generalized Assignment
Problem?<br>
<a
href="https://github.com/coin-or/Dip/tree/master/Dip/examples/GAP"
rel="noreferrer" target="_blank"
moz-do-not-send="true">https://github.com/coin-or/Dip/tree/master/Dip/examples/GAP</a><br>
<br>
For example, in GAP_DecompApp.cpp, I noticed that the
setModelRelax call <br>
passes NULL as first argument:<br>
<br>
setModelRelax(NULL, modelName, i);<br>
<br>
whereas in GAP_DecompApp3.cpp, an other model is
defined:<br>
<br>
status = createModelPartKP(modelRelax, i);<br>
modelName = "KP" + UtilIntToStr(i);<br>
setModelRelax(modelRelax, modelName, i);<br>
<br>
What does that mean? I haven't found any documentation
about it<br>
<br>
Florian<br>
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