scip

问题 I am having issues summing over an exponential equation and using this as is the objective function. Am I able to use the exponential equation in the objective function? If not, is it possible to put the exponential function in as a constraint? Any help on this would be appreciated. import pandas as pd from pyscipopt import Model, quicksum, multidict, exp num_fac_to_open = 1 order_to_open = [] opened_fac = [] closed_fac = [0, 1, 2] S = [0, 1, 2] R = [10, 11, 12] distance_dict = {(0, 10): 300

问题 I'm new to Google OR-Tools. Using Python, I implemented a MIP model with SCIP as a solver. The objective function is for minimization ( solver.Minimize(C) ) and I am accessing the final solution through solver.Objective().Value() . However, I also need to access the intermediate solutions that the solver finds, before reaching the final one, and their timestamp . (The final goal is to plot a graph with the solutions evolution through time). I tried to use a while loop: solutions_evolution = {

问题 I am trying to find out how SCIP treats SAT problems. In the SCIP website, it is recommended to type 'set emphasis cpsolver' in the command line for SAT problems after reading the cnf file. The SCIP solver would then do its own thing after typing 'optimize'. I am not particularly skilled in code tracing and would like to know the pathway the SCIP solver takes after typing the 'set emphasis cpsolver' command. Does this command take the SAT problem and simply call a SAT solver from elsewhere?

问题 I want to find the symmetry group of an integer linear program. I think there is a function in skip called SCIPgetGeneratorsSymmetry . I how I can use this function? 回答1: You are right, to access symmetry information in SCIP, you have to call the function SCIPgetGeneratorsSymmetry() via C/C++. Note that you need to link SCIP against the external software bliss, because otherwise, SCIP is not able to compute symmetries of your (mixed-integer) linear program. If you set up your (mixed-integer)

问题 I am trying to make the SCIP work with C++ in Windows 10. I want to solve the VRP problem using SCIP (version 3.2.1) in Visual Studio 2010. I have downloaded Source files and then precompiled dlls from the http://scip.zib.de and included the .hpp and cpp files in my VS project. there was a .dll, a .exe and a .lib file in the archive. In the project properties I did the following: C/C++ -> General -> Additional Include Directories: C:\scipoptsuite-3.2.1\scip-3.2.1\src\ C/C++ -> Linker -> Input

问题 I just tried installing PySCIPOpt with pip by doing "pip install pyscipopt", however I get the following error message: What am I doing wrong? I'm running Python 2.7 on a 64-bit Windows 10 machine. It wouldn't let me post the question like this, so I deleted some obvious parts from the error message below. Collecting pyscipopt Using cached PySCIPOpt-1.2.0.tar.gz Building wheels for collected packages: pyscipopt Running setup.py bdist_wheel for pyscipopt ... error Complete output from command

问题 I have a quadratic optimization problem with linear constraints that I want to solve using SCIP . The optimization matrix that I want to be minimized is positive semi-definite (it is the variance of certain variables, to be precise). I have the problem in a file in CPLEX LP format and when I optimize in SCIP , I get the message Quadratic constraint handler does not have LAPACK for eigenvalue computation. Will assume that matrices (with size > 2x2) are indefinite. So SCIP starts optimization

问题 This might be a quite basic question, however, I did not find any suggestions so far. I am running the Scip Opt Suite on OSX and everything runs well so far. No I wanted to start to model my first mathematical problem in zimpl, however I do not know how to start. However, in the user's guide there is just prescribed how to load existing zpl-files, but not how to create on files. Do you have any suggestions or any further threads dealing with that task? Kind Regards 回答1: In the zimpl package

问题 I am trying to use SCIP solver for optimization. I am able to pip install the pyscipopt, but while trying to import I get the following error ImportError: DLL load failed: The specified module could not be found. How can I import pyscipopt? 回答1: Which module was not found? I guess it must be the libscipopt.so , right? Did you follow the installation instructions, especially the bit about setting the PATH in Windows? 来源： https://stackoverflow.com/questions/45424309/pip-installation-of

问题 I followed the steps described in the README in scip/interfaces/jni and when I get to step 6: make, it compiles all right untill I get this error: In file included from src/JniScipLibraryLoader.c:25:0: src/JniScipLibraryLoader.h:2:17: fatal error: jni.h: Aucun fichier ou dossier de ce type compilation terminated. Makefile:516 : la recette pour la cible « obj/O.linux.x86_64.gnu.opt/JniScipLibraryLoader.o » a échouée make: *** [obj/O.linux.x86_64.gnu.opt/JniScipLibraryLoader.o] Erreur 1 What I