For example, the objective function can be the weight of a mechanical structure that is to be minimized subject to sizing and shape variables, and that the constraints impose limitations on structural response quantities, e.g., upper bounds for stresses or displacements under static loads. We assume that f(x,y) and g₁(x,y), ... ,g_m(x,y) are continuously differentiable subject to x.
EASY-OPT ^Express is an interactive user interface running under MS-Windows XP or later, to facilitate the formulation of nonlinear programming problems, their implementation and numerical solution. It is possible to minimize nonlinear functions subject to any nonlinear equality or inequality constraints.

For parameter estimation or data fitting, respectively, see EASY-FIT ^Express or EASY-FIT ^ModelDesign .

Features

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Articles and Resources

 

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Features:
    · general
            arbitrary objective functions depending on optimization variables
            continuous, integer, or boolean variables
            additional nonlinear equality or inequality constraints
            large number of standard test examples
            modeling language for nonlinear functions
    · numerical routines
            SQP code NLPQLP for continuou optimization                   
            extended SQP code MISQP for mixed-integer optimization
            automatic differentiation subject to continuous variables
            extremely fast
   · user interface
            convenient and flexible modeling language
            'find' and 'filter' commands
            reports and optimization history plots (Gnuplot)
    · limitations
            200 variables
            1,000 constraints
      · modeling language (PCOMP)
            highly flexible statements depending on optimization variables
            tabulated data, splines, linear and piecewise constant interpolation
            indexed variables and functions
            (nearly) no limitations for number of lines of code
   · implementation
            numerical routines in Fortran, executable outside of the GUI
            GUI in VBA, Microsoft Access, run-time version included
            database with 384 examples
            Windows XP or later

... for more information see the documentation, see easy_opt.pdf

 

Download:

To download EASY-OPT^Express, click here.

 

Support:

For more questions about features, installation, numerical routines, please contact

Prof. Klaus Schittkowski
Department of Computer Science	phone: (+49)921 553278
University of Bayreuth	fax: (+49)921 553238
D-95440 Bayreuth, Germany	klaus.schittkowski@uni-bayreuth.de

 

Articles and Resources:

    · continuous test examples: the Hock-Schittkowski collection, the second collection
    · mixed-integer test examples: the MINLP collection
    · documentation
    · many more publications