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<div class="moz-cite-prefix">Babak,<br>
<br>
Probably Clp uses a tighter tolerance - the default primal
tolerance is 1.0e-7.<br>
<br>
When I do "clp 2.lp", Clp's presolve says infeasible but solves it
anyway. If I look at solution I find - <br>
<br>
** x2816 -3.7280722e-07 i.e. infeasible when unscaled<br>
<br>
If I switch off scaling it says it is infeasible with sum of
infeasibilities 7.8510045e-06.<br>
<br>
With tolerance of 5.0e-7 it solves with or without scaling - but
presolve still says it is infeasible as it uses its own tolerance
- normally 1.0e-8. So set -preTolerance 5.0e-7.<br>
<br>
Check what tolerance glpk or gurobi is using.<br>
<br>
John Forrest<br>
<br>
<br>
On 21/02/15 03:32, Babak Moazzez wrote:<br>
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cite="mid:CAEHJM4mKbbBZKpPc=rM0+aff5JdJ_+j_HO6hP+EDkx88WBTKHw@mail.gmail.com"
type="cite">
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<div dir="ltr">
<div>I just found out that this happens in Clp 1.15. I tried Clp
1.06 and it was able to solve it.<br>
<br>
</div>
Babak<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Feb 20, 2015 at 7:18 PM, Babak
Moazzez <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:bmoazzez@ucdavis.edu" target="_blank">bmoazzez@ucdavis.edu</a>></span>
wrote:<br>
<blockquote class="gmail_quote">
<div dir="ltr">
<div>
<div>Hi<br>
<br>
</div>
I have a model (attached) that clp says it's infeasible.
But gurobi and glpk solve it. Could someone help me
figure this out?<br>
<br>
</div>
Thanks.<span class="HOEnZb"><br>
<div>
<div>
<div><br>
<div>
<div dir="ltr">Babak<br>
</div>
</div>
</div>
</div>
</div>
</span></div>
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<br>
<br>
<br>
-- <br>
<div class="gmail_signature">
<div dir="ltr">Babak Moazzez<br>
Post Doctoral Scholar<br>
University of California Davis<br>
<br>
Email: <a moz-do-not-send="true"
href="mailto:bmoazzez@ucdavis.edu" target="_blank">bmoazzez@ucdavis.edu</a><br>
Tel: (530) 752 5076<br>
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