OPTANO.Modeling 2.0.0.286

The OPTANO Modeling library allows you to use C# as a Modeling language for mathematical optimization (mixed integer programming (MIP) and linear programming (LP)). It has a lightweight footprint and connects to several solvers.

There is a newer version of this package available.
See the version list below for details.
Install-Package OPTANO.Modeling -Version 2.0.0.286
dotnet add package OPTANO.Modeling --version 2.0.0.286
<PackageReference Include="OPTANO.Modeling" Version="2.0.0.286" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add OPTANO.Modeling --version 2.0.0.286
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Release Notes

http://docs.optano.com/modeling/current/changelog.html

Version 2.0.0 has been tested to comply with dotnet standard 2.0.



• Breaking Change: Removed  and replaced it with @OPTANO.Modeling.Optimization.Implication
o The reasoning behind this is that we tried to create a more intuitive API. Since a  basically was a "backwards implication", and the constructor required a @OPTANO.Modeling.Optimization.Not-constraint, the final effect was not apparent.
o The new @OPTANO.Modeling.Optimization.Implication operator clearly states which constraint will be the @OPTANO.Modeling.Optimization.Implication.Premise and which one will be the @OPTANO.Modeling.Optimization.Implication.Premise.Conclusion.
• Breaking Change: The signature of @OPTANO.Modeling.Optimization.GenericVariableCollection{T} was changed.
o The DebugNameGenerator delegate's signature was changed to (index) => string.
 Previously: (index) => StringBuilder
o Initially, we tried to enforce the usage of @System.Text.StringBuilder in order to prevent the user specifying names with long chains of string + string + ...
o With the introduction of short names, this style will not affect performance in a productive environment.
o We'd still suggest using either string.Format(), string interpolation, or expressions like 'new @System.Text.StringBuilder().Append() ... Append().ToString().
• Improvement: Better handling of BigM
o BigM is required during the transformation of @OPTANO.Modeling.Optimization.OperatorExpressions, such as @OPTANO.Modeling.Optimization.Abs to 'linear expressions'.
 User can provide an optional BigM when such a @OPTANO.Modeling.Optimization.OperatorExpression is created.
o New implementation for the automatic derivation of a BigM
 When @OPTANO.Modeling.Optimization.Variables have finite bounds, the maximum row sum is computed and used as BigM
 Only when this fails, the user-provided BigM is used.
 If user does not provide a finite BigM, an @System.InvalidOperationException is thrown.
• Improvement: Centralized name-cleansing and unified behavior among different types (Variable, Constraint, Objective, VariableCollection, @OPTANO.Modeling.Optimization.OperatorConstraint)
o Also, Constraint and Objective now use the same counter for the base64 suffixes
o This prevents duplicate name issues when exporting a model to MPS.
• Improvement: Operator '==' now creates a nicer Constraint for 'Variable x == double c'
o Old: 0 <= x - c < 0 (even if c = 0).
o New: c <= x < c
• Change: Configuration.CopySolutionToModel == true in default (was false)
• Change: @OPTANO.Modeling.Optimization.Expression.Evaluate now requires the passed values for the @OPTANO.Modeling.Optimization.Variables to be within the range of [LowerBound, @OPTANO.Modeling.Optimization.Variable.UpperBound].
• Fix: Gurobi ISV Keys have not been handled correctly
• Fix: Improved the stability of he LP- and MPS Reader/Writers. They are used for im-/export of models when a solver does not provide a native API.
• Fix: In some cases the ExpressionNormalizer threw a @System.Collections.Generic.KeyNotFoundException. Cases now are handled correctly.
• Fix: ModelTransformation
o @OPTANO.Modeling.Optimization.OperatorExpressions were not remove from the Model after they were transformed
o Some helper-constraints were not marked as helper and thus not removed from the Model even though RestoreUserModelAfterSolve was set to true.
o Normalizing all @OPTANO.Modeling.Optimization.Expressions before transforming them
 Can prevent issues while encountering @OPTANO.Modeling.Optimization.Times operators during derivation of BigM
o In a helper method BigM falsely was used, when working with a 'lower bound @OPTANO.Modeling.Optimization.Constraint'.
• Fix: @OPTANO.Modeling.Optimization.Model.RemoveConstraint now also looks for @OPTANO.Modeling.Optimization.OperatorConstraints
o Before, @OPTANO.Modeling.Optimization.OperatorConstraints could not be removed from the Model.
Please also take the changes of alpha01 und alpha02 into account, when upgrading from version 1.6.

NuGet packages (3)

Showing the top 3 NuGet packages that depend on OPTANO.Modeling:

Package Downloads
Optimization.Framework
The Optimization.Framework allows you to use C# as a modelling language for mathematical optimization. It furthermore allows you to use solvers as services.
OPTANO.Modeling.Gurobi
State of the Art Mathematical Programming Solver This package ships all files to run Gurobi with OPTANO Modeling on win64 and linux64. No additional installation required. When running on linux, please also install gurobi as usual. OPTANO.Modeling.Gurobi comes with a size-limited Gurobi license (Package OPTANO Modeling required). Please visit https://www.gurobi.com/partners/optano to obtain an unlimited license.
Flips
A F# library for creating and solving Linear Programming and Mixed Integer Programming Models

GitHub repositories

This package is not used by any popular GitHub repositories.

Version History

Version Downloads Last updated
3.4.1.490-beta 50 8/20/2020
3.4.0.489 186 7/16/2020
3.3.0.474 810 2/21/2020
3.2.2.468 190 1/16/2020
3.2.1.467 162 1/9/2020
3.2.0.464 195 1/8/2020
3.1.0.460 159 12/10/2019
3.0.1.451 4,489 5/6/2019
3.0.0.450 203 4/29/2019
2.16.1.452 636 5/6/2019
2.16.0.445 225 4/25/2019
2.15.0.435 247 4/4/2019
2.14.1.430 252 2/14/2019
2.14.0.429 196 1/31/2019
2.14.0.428-pre2 303 1/14/2019
2.14.0.426-pre 297 1/14/2019
2.12.1.423 318 12/19/2018
2.12.0.415 229 12/15/2018
2.11.3.409 229 12/4/2018
2.11.2.408 297 12/3/2018
2.11.1.407 211 12/2/2018
2.11.0.403 257 11/29/2018
2.9.0.384 1,899 9/5/2018
2.8.1.343 499 5/25/2018
2.8.0.338 330 5/16/2018
2.7.0.336 450 5/2/2018
2.6.0.319 411 3/14/2018
2.5.0.312 558 1/24/2018
2.4.1.311 516 1/24/2018
2.4.0.303 806 11/15/2017
2.3.0.299 453 10/18/2017
2.2.0.291 453 9/28/2017
2.1.0.289 579 9/5/2017
2.0.0.286 536 9/3/2017
2.0.0.278-alpha02 467 8/26/2017
2.0.0.276-alpha01 435 8/20/2017
1.6.1.259 489 8/10/2017
1.6.0.252 462 8/4/2017
1.5.0.247 505 7/13/2017
1.4.0.236 535 5/8/2017
1.3.0.232 499 4/20/2017
1.2.3.222 627 3/6/2017
1.2.2.216 532 3/4/2017
1.2.1.207 587 3/3/2017
1.2.0.201 532 2/23/2017
1.1.0.191 570 1/3/2017
1.0.0.172 558 12/23/2016
0.9.1.163 547 11/23/2016
0.9.0.156 985 11/1/2016
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