Easy-fit express 1.0 2009 free download

EASY-FIT Express 1.0 2009

Nonlinear Parameter Estimation

EASY-FIT Express is an interactive user interface to solve constrained nonlinear data fitting (parameter estimation, regression, curve or surface fittiting) problems. The mathematical method is based on a Gauss-Newton-SQP algorithm and represents the scientific state-of-the-art. 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, second independent model variable called concentration

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 levels for estimated parameters

User interface: convenient and flexible modeling language, 'find' and 'filter' commands, extensive report and graphics facilities, also for Gnuplot, 3D plots for two model or input variables (surface fitting), in- and output of data from and to text or Excel files

Limitations: 30 fitting criteria and data sets, 100 model variables, 2,000 time values, 3,000 experimental data, 200 linear or nonlinear constraints

Modeling language (PCOMP) : highly flexible statements depending on parameters to be estimated, tabulated data, splines, linear and piecewise constant interpolation

Implementation: numerical routines in Fortran executable outside of the GUI, GUI in VBA, Microsoft Access 2007 run-time version included, database with 240 examples, Windows XP or Vista (contact the author for Win 2K version)

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