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<div class="moz-cite-prefix">Definitely an error. Will look into
it.<br>
<br>
John Forrest<br>
<br>
On 06/05/17 23:52, Aleksandr M. Kazachkov wrote:<br>
</div>
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cite="mid:CABsukB=RDRpw6F+bWtz6WKPZ0My9_Q3aGS=hCO+MCwUWDHCAvA@mail.gmail.com"
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<div dir="ltr">The objective is all-zeroes, because I was just
checking feasibility at the point the error occurred. When
presolve is on, it solves to optimality (objective value 0) and
says that it is feasible. When presolve is off, I get nan or an
assertion failure.
<div><br>
</div>
<div>Now, if I add the first >= constraint as the objective
(it is a minimization problem), we should be either primal
infeasible or optimal. When presolve is on, I get optimal;
when presolve is off, I get "Clp0001I Primal infeasible -
objective value -nan".</div>
<div><br>
</div>
<div>The lp file with the new objective is attached.</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Sat, May 6, 2017 at 6:32 PM Sébastien Roy
<<a moz-do-not-send="true"
href="mailto:sebastien.roy.sr@gmail.com" target="_blank">sebastien.roy.sr@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote">
<div dir="ltr">This usually means your linear program is
unbounded so the objective function value is infinity. If
your modeling a problem that should bound you must have an
error in your linear program model.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">
<div class="gmail_quote">On Sat, May 6, 2017 at 6:20 PM,
Aleksandr M. Kazachkov <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:akazachk@cmu.edu" target="_blank">akazachk@cmu.edu</a>></span>
wrote:<br>
</div>
</div>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote">
<div dir="ltr">Hi everyone,
<div><br>
</div>
<div>I am not sure if there is something wrong with
my setup, or if this is a bug, but I would
appreciate any help in either case. Thank you in
advance!<br>
</div>
<div><br>
</div>
<div>I have Clp version 1.16 set up on a Fedora
machine. The compilation options are:
enable_debug=yes, enable_gnu_packages=yes, and I
am using blas and lapack. There are no problems
when I run "make test".</div>
<div><br>
</div>
<div>However, on the following LP (which solves fine
when using Bcp-1.4.3, which maybe is using an
older version of Clp), when presolve (initial) is
off, I get that the objective value is "nan". In
the context this LP came up (but not when I saved
it and ran it on its own), I got the following
assertion failure: </div>
<div>../../../Clp/src/ClpSimplexDual.cpp:3216: int
ClpSimplexDual::changeBounds(int,
CoinIndexedVector*, double&): Assertion
`!("should not be here")' failed.<br>
</div>
<div><br>
</div>
<div>Specifically, I get the error after the
following two lines:</div>
<div> solver.setHintParam(OsiDoPresolveInInitial,
false); </div>
<div> solver.initialSolve();</div>
</div>
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<div class="gmail_quote">
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