Solve the factory production scheduling problem, no error after running without solving

by chen

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Apr 12, 2020, 9:45:36 PM4/12/20

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Dear John:

Sorry to disturb you. Recently, I am using YALMIP to model the production scheduling problem in a factory. The factory is powered by the power grid and the boiler is provided with heat. The goal is to minimize the operating cost of 24 hours a day. But when I add an upper bound constraint on the value of buying electricity from the grid, running this program in MATLAB has no response. Remove this constraint and the model can be solved. The specific code is in the attachment.

Thank you in advance.

CODE.m

Johan Löfberg

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Apr 13, 2020, 2:42:50 AM4/13/20

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First, your objective is a vector. Not what you intended I guess

I get the same (in 12.8), likely bug in cplex. Works without problems in gurobi in 20s

by chen

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Apr 13, 2020, 5:43:58 AM4/13/20

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Thank you very much, there is another question, when calling gurobi to solve, what statement should be used to change the optimization gap?

Johan Löfberg

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Apr 13, 2020, 7:17:46 AM4/13/20

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there's a bunch of gaps

>> ops.gurobi

ans =

struct with fields:

BarIterLimit: Inf

Cutoff: Inf

IterationLimit: Inf

NodeLimit: Inf

SolutionLimit: Inf

TimeLimit: Inf

BarConvTol: 1.0000e-08

BarQCPConvTol: 1.0000e-06

FeasibilityTol: 1.0000e-06

IntFeasTol: 1.0000e-06

MarkowitzTol: 0.0078

MIPGap: 1.0000e-04

MIPGapAbs: 1.0000e-10

OptimalityTol: 1.0000e-06

PSDTol: 1.0000e-06

InfUnbdInfo: 0

NormAdjust: -1

ObjScale: 0

PerturbValue: 2.0000e-04

Quad: -1

ScaleFlag: 1

Sifting: -1

SiftMethod: -1

SimplexPricing: -1

BarCorrectors: -1

BarHomogeneous: -1

BarOrder: -1

Crossover: -1

CrossoverBasis: 0

QCPDual: 0

BranchDir: 0

ConcurrentMIP: 1

Heuristics: 0.0500

ImproveStartGap: 0

ImproveStartNodes: Inf

ImproveStartTime: Inf

MinRelNodes: 0

MIPFocus: 0

MIQCPMethod: -1

NodefileDir: '.'

NodefileStart: Inf

NodeMethod: 1

PumpPasses: 0

RINS: -1

SolutionNumber: 0

SubMIPNodes: 500

Symmetry: -1

VarBranch: -1

ZeroObjNodes: 0

TuneOutput: 2

TuneResults: -1

TuneTimeLimit: -1

TuneTrials: 2

Cuts: -1

CliqueCuts: -1

CoverCuts: -1

FlowCoverCuts: -1

FlowPathCuts: -1

GUBCoverCuts: -1

ImpliedCuts: -1

MIPSepCuts: -1

MIRCuts: -1

ModKCuts: -1

NetworkCuts: -1

SubMIPCuts: -1

ZeroHalfCuts: -1

CutAggPasses: -1

CutPasses: -1

GomoryPasses: -1

AggFill: 10

Aggregate: 1

DisplayInterval: 5

DualReductions: 1

FeasRelaxBigM: 1000000

IISMethod: -1

LogFile: ''

Method: -1

NumericFocus: 0

PreCrush: 0

PreDepRow: -1

PreDual: -1

PreQLinearize: -1

PrePasses: -1

Presolve: -1

PreSparsify: 0

ResultFile: ''

Threads: 0

by chen

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Apr 13, 2020, 8:20:22 AM4/13/20

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Thank you very much for your reply. I would like to ask what command should be used to change the value of MIPGAP?

Johan Löfberg

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Apr 13, 2020, 9:04:32 AM4/13/20

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I just showed you all the available options, I don't know of any more

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