Software Listing of Author : "Klaus Schittkowski"
- EASY-FIT Express
- License: Freeware
- Price: 0.00


The software system solves constrained nonlinear parameter estimation problems. Synonyms are data fitting, nonlinear regression, parameter identification, curve and surface fitting. The numerical methods are based on highly efficient Gauss-Newton-SQP algorithms. Model functions are defined in a modeling language called PCOMP and are interpreted and evaluated during runtime.
General: Arbitrary fitting criteria depending on parameters to be estimated, additional nonlinear equality or inequality constraints, and optionally on a second independent model variable
Numerical routines: Gauss-Newton-type SQP methods, automatic differentiation, alternative norms (sum of absolute values, maximum of absolute values), confidence intervals for estimated parameters, correlation and covariance matrix, identification of significance...
- Publisher: Klaus Schittkowski
- Date Released: 15-03-2009
- Download Size: 64000 KB
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- Platform: WinOther, WinVista
- EASY-FIT ModelDesign
- License: Demo
- Price:


The system solves constrained nonlinear parameter estimation (nonlinear regression, data, curve and surface fitting) problems based on ODEs, DAEs, PDEs, PDAEs, steady-state systems, Laplace equations, and analytical functions. A statistical analysis provides confidence intervals, correlation and covariance matrix, identification of significant parameters, and allows optimum experimental design. Model equations are defined in a modeling language called PCOMP and are interpreted and evaluated during runtime. General: Arbitrary fitting criteria depending on the solution of a dynamical system, e.g., of a differential equation, and the parameters to be estimated; additional nonlinear equality or inequality constraints, second independent model variable called concentration Numerical routines: Gauss-Newton-type SQP methods for least...
- Publisher: Klaus Schittkowski
- Date Released: 03-02-2009
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- Platform: WinOther, WinVista
- EASY-OPT Express
- License: Freeware
- Price: 0.00


The software system allows to solve constrained nonlinear programming problems by an efficient sequential quadratic programming (SQP) method. A nonlinear objective function is to be minimized subject to nonlinear equality or inequality constraints. The mathematical method represents the scientific state-of-the-art. Model functions are defined in a modeling language called PCOMP and are interpreted and evaluated during runtime. It is assumed that all nonlinear functions are differentiable. Gradients are computed automatically. EASY-OPT Express is particularly useful for classroom exercises of optimization courses or to become familiar with optimization routines before starting a real life implementation. The mathematical theory of the algorithm is described in the documentation and the usage of the system is outlined in detail....
- Publisher: Klaus Schittkowski
- Date Released: 15-03-2009
- Download Size: 60268 KB
- Download
- Platform: WinOther