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<div class="moz-cite-prefix">Dear Alan,<br>
<br>
what happens if you pass the Gurobi solution to SCIP? It most
likely complains about some small violation of a bound or
constraint. Can you please do so and send us the message of SCIP
after passing the solution?<br>
<br>
Regards,<br>
Gregor<br>
<br>
Am 15.07.2014 17:15, schrieb Alan Porto Bontempo:<br>
</div>
<blockquote
cite="mid:CAExMG_cY9Aq5dR1fowGFWL1f+nDkS+3OFH99k4DOiv2m35Hr_Q@mail.gmail.com"
type="cite">
<div dir="ltr">Hi,
<div><br>
</div>
<div>I have a large problem to solve:</div>
<div><br>
</div>
<div>original problem has 3646 variables (503 bin, 0 int, 0
impl, 3143 cont) and 7619 constraints</div>
<div><br>
</div>
<div>I know this problem has a solution because gurobi solve it
very fast and scip says me it is infeasible.</div>
<div><br>
</div>
<div>For now i am using this sets of configurations:<br>
</div>
<div><br>
</div>
<div>
<div># maximal time in seconds to run</div>
<div># [type: real, range: [0,1.79769313486232e+308], default:
1e+20]</div>
<div>limits/time = 1000</div>
<div><br>
</div>
<div># solving stops, if the absolute gap = |primalbound -
dualbound| is below the given value</div>
<div># [type: real, range: [0,1.79769313486232e+308], default:
0]</div>
<div>limits/absgap = 1e-5</div>
<div>
<br>
</div>
<div># solving stops, if the relative gap = |primal -
dual|/MIN(|dual|,|primal|) is below the given value</div>
<div># [type: real, range: [0,1.79769313486232e+308], default:
0]</div>
<div>limits/gap = 0.0001</div>
<div><br>
</div>
<div># maximal memory usage in MB; reported memory usage is
lower than real memory usage!</div>
<div># [type: real, range: [0,1.79769313486232e+308], default:
1e+20]</div>
<div>limits/memory = 250</div>
<div><br>
</div>
<div># maximal number of nodes to process (-1: no limit)</div>
<div># [type: longint, range: [-1,9223372036854775807],
default: -1]</div>
<div>limits/nodes = 40000</div>
<div><br>
</div>
<div># maximal number of total nodes (incl. restarts) to
process (-1: no limit)</div>
<div># [type: longint, range: [-1,9223372036854775807],
default: -1]</div>
<div>limits/totalnodes = 200000</div>
<div><br>
</div>
<div>################## precisão numérica</div>
<div># absolute values smaller than this are considered zero</div>
<div># [type: real, range: [1e-20,0.001], default: 1e-09]</div>
<div>numerics/epsilon = 1e-9</div>
<div><br>
</div>
<div># absolute values of sums smaller than this are
considered zero</div>
<div># [type: real, range: [1e-17,0.001], default: 1e-06]</div>
<div>numerics/sumepsilon = 1e-6</div>
<div><br>
</div>
<div># feasibility tolerance for constraints</div>
<div># [type: real, range: [1e-17,0.001], default: 1e-06]</div>
<div>numerics/feastol = 1e-8</div>
<div><br>
</div>
<div>########### LP solver</div>
<div># iteration limit for each single LP solve (-1: no limit)</div>
<div># [type: longint, range: [-1,9223372036854775807],
default: -1]</div>
<div>#lp/iterlim = 1000</div>
<div><br>
</div>
<div># iteration limit for initial root LP solve (-1: no
limit)</div>
<div># [type: longint, range: [-1,9223372036854775807],
default: -1]</div>
<div>#lp/rootiterlim = 2000</div>
<div><br>
</div>
<div># should the LP solver display status messages?</div>
<div># [type: bool, range: {TRUE,FALSE}, default: FALSE]</div>
<div>#display/lpinfo = TRUE</div>
</div>
<div><br>
</div>
<div>What other configurations i can set to try to make my
problem feasible? Or what changes can I make to its set of
configurations?</div>
<div><br>
</div>
<div>In the gurobi solution there are many small negative
values, how do i allow this kind of things in scip?</div>
<div><br>
</div>
<div>Thanks.<br>
<div>
<div><br>
</div>
-- <br>
Até.<br>
<br>
Alan Porto Bontempo
</div>
</div>
</div>
<br>
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