Easy-Fit Express 1.4

Klaus Schittkowski in Education / Other

Easy-Fit Express screenshot

User Rating: 2.8 (36 votes)

Easy-Fit Express is an application that was designed to solve 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.

Features:
· 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, various versions
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
extremely fast routines
· 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, respectively
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
- limited by size of internal working arrays
· modeling language (PCOMP)
highly flexible statements depending on parameters to be estimated
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 2007, run-time version included
database with 240 examples
Windows XP or Vista (contact the author for Windows 2K version)

File Size: 63.5 MB License: Freeware Price: FREE
Platform: Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64
Downloads: Total: 180 | This Month: 0 Released: 2013-12-02
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