Qi Chen
Qi Chen
``` from pyomo.environ import * m = ConcreteModel() m.x = Var() m.c = Constraint(expr=m.x >= 1) m.p = Param(mutable=True, initialize=5) m.y = Var(bounds=(m.p, 3)) m.o = Objective(expr=m.x) SolverFactory('gurobi').solve(m) m.display() ```...
In the interest of easier modeler troubleshooting, display() and pprint() should have the ability to suppress the output of Blocks/IndexedComponents that are not activated. That is, not only not display...
In a discussion with @jsiirola about other issues, we stumbled across the following: An open discussion exists for how writers and transformations should deal with unknown components. This includes things...
Moved from TRAC as part of COIN fORgery: https://projects.coin-or.org/Clp/ticket/50 In stable/1.14, in the isBinary() method of OsiClpSolverInterface?.cpp around line 2718, a comparison of bounds with 1 and 0 is made...
Moved from TRAC as part of COIN fORgery: https://projects.coin-or.org/Clp/ticket/60 Doesn't occur every time, but generally! Attached qps file. Tested with trunk changeset 1976 and reproduced.
Title: `Assertion triggered - ClpPrimalColumnSteepest.cpp:590: virtual int ClpPrimalColumnSteepest::pivotColumn(CoinIndexedVector*, CoinIndexedVector*, CoinIndexedVector*, CoinIndexedVector*, CoinIndexedVector*): Assertion `model_->reducedCost(bestSequence) > 0.0' failed.` Moved from TRAC as part of COIN fORgery: https://projects.coin-or.org/Clp/ticket/59 Got the `ClpPrimalColumnSteepest?.cpp:590: virtual...
Moved from TRAC as part of COIN fORgery: https://projects.coin-or.org/Clp/ticket/54 The attached code reads an LP file, initialSolve(), markHotStart(), change both bounds of variable 11 to 3, solveFromHotStart(), change both bounds...
Moved from TRAC as part of COIN fORgery: https://projects.coin-or.org/Clp/ticket/53 Hello, first of all this bug report started from this CBC one: https://projects.coin-or.org/Cbc/ticket/115 I add that I tested with the latest...
Moved from TRAC as part of COIN fORgery: https://projects.coin-or.org/Clp/ticket/49 Hi, Depending on the version of Clp I use, the small problem at the end of this post (that is created...
Moved from TRAC as part of COIN fORgery: https://projects.coin-or.org/Clp/ticket/24 Using Clp trunk from 2008/09/15, I setup a QP problem as follows: ``` ClpSimplex* simplex = new ClpSimplex(); CoinPackedMatrix* matrix =...