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Questions tagged [scip]

Software package for solving mixed integer linear and nonlinear programming problems and part of the SCIP Optimization Suite. SCIP is distributed under the Apache 2.0 license and its C source code is available.

Mixed integer programming is the task to optimize a linear functional over a polyhedron, where some or all variables are constrained to be integer. The SCIP Optimization suite offers a branch-and-cut implementation, and a standalone implementation of the Simplex algorithm, called SoPlex, to solve linear programming problems.

Furthermore, SCIP comes with a modelling language ZIMPL that aims to ease the task of formulating mixed integer programming problems, a parallel solver called UG, and an implementation of the branch-and-cut-and-price algorithm called GCG.

The SCIP Optimization suite is one of the fastest implementations whose source code is available. It is written in C, but also offers a C++ interface.

<= 03.11.2022:
  • SCIP is free for academic research and can be licensed for commercial use.
>= 04.11.2022:
  • SCIP (as well as SoPlex) is distributed under the Apache 2.0 license.
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Installation error for PySCIPOpt in vscode Mac Ventura OS

I am working on a Mixed Interger Linear Programming problem. I wanted to use SCIP solver to find the optimised solution for my problem. I was trying to install "PySCIPOpt" package in vscode which resulted in the following error. error while running…
Hema Sadhasivan
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BESTSOLFOUND event handler on PySCIPopt

I am working on the problem in which I am willing to check and test some of the SCIP's event handlers. I see this SCIP document page and have some questions: Do the event handlers callbacks return with something that may be printable? or just for…
A.Omidi
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SCIP: Find a feasible but not optimal solution to a large LP

I asked this on the soplex mailing list, but no answer yet: http://listserv.zib.de/pipermail/soplex/2022-August/000001.html I tried scip, and it took 30sec. Maybe because it performs pre-solve. Is there an easy way to achieve my objective: Specify…
Zohar Levi
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How can I disable warning output in SCIP?

How can I fix the warning: WARNING: Original variable not released when freeing SCIP problem . which is spammed once per x. Option 1: Disable output. Ref: https://www.scipopt.org/doc/html/PARAMETERS.php Verblevel=0 disables stdout,…
Josh Vander Hook
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How to run automated tests with SCIP

I´m new in Scip and trying to make automated testing with Scip. There is the website https://www.scipopt.org/doc-4.0.1/html/TEST.php but I´m not getting it what to do or doing it wrong. Does someone has experience with automated testing using…
Lukas Ebner
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Meaning of values in SCIP_NodeType

Is there a combination of parameter settings so that the search tree only contains "simple" node types, i.e. not SCIP_NODETYPE_{PROBINGNODE, DEADEND, JUNCTION, PSEUDOFORK, FORK, SUBROOT, REFOCUSNODE}? Even if it means disabling some…
user2660278
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Retreive optimization variables values with expression

I am using PySCIPOpt to solve a ILP problem. The type of the variables I am using is either binary or integer. When retreiving the variables using model.getVal(VariableName) I get this error for some variables: TypeError: Argument 'var' has…
Benoît Châtelain
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SCIP: no reader for input file available

I have an input problem which need to solve with SCIP: Maximize obj: x1 + 2 x2 + 3 x3 + x4 Subject To c1: - x1 + x2 + x3 + 10 x4 <= 20 c2: x1 - 3 x2 + x3 <= 30 c3: x2 - 3.5 x4 = 0 Bounds 0 <= x1 <= 40 2 <= x4 <= 3 General x4 End I…
Daniel
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SCIP solver: ERROR: method createConsBasicQuadratic is not implemented yet

When using SCIP solver I'm getting the following error: [info] Running org.allenai.iqclid.ilpsolver.ilpModel [info] 18:09:25.423 [main] DEBUG o.a.iqclid.ilpsolver.ScipSolver - Java library path = /Users/danielk/ideaProjects/iqclid/lib [error]…
Daniel
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SCIPsolve fails for the simple optimization program

I'm trying to solve simple optimization problem using SCIP but the method SCIPsolve returns exception. The problem is: Minimize x + y + z subject to: xyz = 1 where x, y and z are integers The source code is given below. Does anybody have idea what's…
Neven Kovacki
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PySCIPOpt/SCIP - Branching/Separation with fractional variable

I began using PySCIPOpt/SCIP for a Coursera course on discrete optimization. I'd need to implement a simple separation from a fractional variable and wonder how to do it. Online SCIP literature does not provide relevant example. Any Python example…
PC_AD
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Is it possible to install scip on centos 6.5

Is there anyone knows if I can install scip in centos 6.5? I take a try but it doesn't work. I don't know i have a mistake in installation process or it can't work on centos! I install scip on ubuntu correctly. thanks in advance, Elnaz
Elnaz
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SCIP: integrality tolerance parameter

In SCIP 3.2.1 MILP solver, what is the parameter for a variable's integrality tolerance? I haven't found one in the list.
glebB
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SCIP _ How to get started

I hope this is not a frequently asked question but i could not find anything with the search function that helped me. I have to solve a linear program for my bachelorthesis and my professor said SCIP will be good to use. I will use the Win 7 binary…
Moritz Wie
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how to install SCIP

I use YALMIP which has to use SCIP to solve my problem. I don't know how to install it on my computer(Win 7). I have download it and the install file told me to enter "make" in my computer. Where should I enter this commend? I typed it in "matlab"…
Ying Ma
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