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<div class="moz-cite-prefix">Hopefully fixed.<br>
<br>
Primal is fine, but when using dual simplex the code likes to have
non basic variables at bounds. This problem has lots of free
variables. Most came in to basis but one did not and was at a
fake bound of 1.0e10 - a perfectly valid optimal solution as
reduced cost was zero. When this looked optimal the code tried
increasing this bound. Owing to a bug and the exact path through
the code, this was repeated until bound got to inf and then nan.<br>
<br>
John Forrest<br>
On 06/05/17 23:20, Aleksandr M. Kazachkov wrote:<br>
</div>
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cite="mid:CABsukBkLwn=i5Wu7mDW3ue+AAw=iBRoCLOZkiJ8KCY7hTOfrSA@mail.gmail.com"
type="cite">
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<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>
<br>
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