Freeware Listing: Data Fitting

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...

  • Platform: WinOther, WinVista

The dwi-toolbox provides a set of free and open-source Matlab routines for the simulation and analysis of Diffusion-Weighted Magnetic Resonance Imaging data. It includes data-fitting, simulation, visualization and statistical components..

  • Platform: Linux, Mac OS X, WinOther

This is a set of scripts that helps with processing of NMR pH titration data. These scripts allow for fitting (using R) and plotting of data of multiple residues. The program needs to be made more user friendly..

  • Platform: Linux, Mac OS X, WinOther

CurvFit (tm) is a curve fitting program for Windows. Lorentzian, Sine, Exponential and Power series are available models to match your data. A Lorentzian series is highly recommended for real data especially for multiple peaked and/or valleys data. CurvFit is another improved productivity example do to using Calculus (level) programming ... ie. minutes to solve, days or years to understand solution and what it implies (e.g. wrong model, sampling rate error, etc.). Helps learn 1) whether math model is good for given data; 2) convergence implies a reasonable solution; 3) how to select new starting initial parameter values.

  • Platform: Win2000, WinXP, Win7 x32, Win7 x64, Windows 8, Windows 10, WinServer, WinOther, WinVista, WinVista x64

Curve Fitter is a practical application that allows you to visualize and to fit data imported from CSV files. The program allows you to edit the data that you want to fit by manually selecting and deleting the points that you want to exclude.

You can examine a certain fragment from the data file by browsing the raw data or by selecting a part of the generated plots. The program also includes a scripting console program that allows you to access all the data fitting and visualization tools.

Note: The program can be used for free but only for non-commercial purposes.



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  • Platform: WinOther

Will produce a linear algebraic expression for a set of paired X,Y data. The PowerForm application was designed to be a data fitting and curve fitting program that will produce a linear algebraic expression for a set of paired X,Y data. Unlike common least squares polynomial methods, Powerform employs positive, negative, integer and fractional exponents which enable visually better curve fits and lends greater accuracy to interpolated data. Power exponents are selected automatically , saving the user time and effort. Powerform includes optional selectable transcendental pre-processing functions which 'straighten' data before fitting takes place.

  • Platform: WinOther

Marketing Plan for Fortran Calculus Language, a business opportunity. For those with contacts in the Engineering & Science world this could be a great opportunity. Fortran Calculus solves most math problems within an hour or two. It's very accurrate! It's based on what is called "Automatic Differentiation" (AD). Calculus languages simplify computer coding to an absolute minimum; i.e., a mathematical model, constraints, and the objective function. Minimizing the amount of code allows the user to concentrate on the science or engineering problem at hand and not on the (numerical) process requirements to achieve an optimum solution.

  • Platform: Win2000, WinOther

The Quadratic Equation Solver posted on this page solves for both real and imaginary (if applicable) results. Also on this site: solvers for the Cubic and Quartic equations, N Equations in N Unknowns, Eigenvalues and Eigenvectors, Cubic Spline Interpolation, Numerical Integration, and Least-Squares Data-Fitting..

  • Platform: JavaScript, Scripts

fitChiSquare is a generalized chi-square fitting routine for any model function when data measurement errors are known; it returns the model parameters and their uncertainties at the delta chi-square = 1 boundary (68% confidence interval). It also returns the chi-square and degrees of freedom (dof) of the fit. The goodness-of-fit may be estimated by comparing chi-square/dof to 1 (<1 is a good fit; >>1 indicates a poor fit). Alternatively, it returns the fit and measurement errors when the model is known - see ErrorUnknown option. Type "help fitChiSquare" or see the header for usage. This function calculates the data variance from reported measurement errors, then calculates the chi-square fit.

  • Platform: Matlab, Scripts

Free software for automation of professional measurement systems, data acquisition, processing and analysis. Especially suitable for scientists who would like to make high-performance, precise measurements in the experimental physics. Optimized for real-time operation, provides OLE-compatible programming model and supports ActiveX scripting. Features include powerful visual tools (graphic editor, digitizer, base line subtractor), wide set of numeric and symbolic calculations, nonlinear Levenberg-Marquardt regression, and more. Distributed with full source code..

  • Publisher: RRR
  • Date: 24-03-2003
  • Size: 2487 KB
  • Platform: Win2000, WinOther

MagicPlot is a handy tool for scientific and engineer data processing, plotting and nonlinear fitting. MagicPlot is powerful enough and consistent. Advantages * Compact: Single file ~2 MB * Multilevel undo function for all actions * Useful plot navigation and scaling * Visual nonlinear curve fitting * Vector images export and copying * Automatic formula recalculation on data change * English ligatures support in labels Limited features.

  • Platform: WinOther

Its a model fitting framework which optimizes the model parameters to make the model output match the desired data..

  • Platform: Linux

Scientific data acquisition and visualization package with easy-to-learnscript language and powerful widgets (including 2D graphs with nonlinearcurve fitting). Support for Serial ports, GPIB devices and Labcards,localy or remotely using RPC over TCP.

  • Platform: Linux, Unix

This is the fastest (though not most accurate) method of fitting a circlle to data points on a plane (given by their xy-coordinates). It returns the circle center (a,b) and radius R. It was proposed by I. Kasa in article "A curve fitting procedure and its error analysis", IEEE Trans. Inst. Meas., Vol. 25, pages 8-14, (1976). Another version of this circle fit has been posted by Izhak Bucher (file 5557)..

  • Platform: Matlab, Scripts

peak-o-mat is a reliable application designed as a curve fitting program written in Python and it allows you to graphically represent spectroscopic data.

It allows for clearing, transforming, fitting, calibrating, etc. of spectra with few mouse clicks. peak-o-mat can easily be extended by writing own modules.

The tree control on the right side of the main window reflects the structure of the project. All sets in one plot are shown together in the plot area left of the tree. The currently selected set is displayed in red, the others in black.

You can select all sets of a plot by selecting the corresponding plot item or (only on wxGTK) a subset of sets within one plot by pressing SHIFT/CTRL-keys while selecting.

  • Platform: WinOther

SASfit is a simple, handy, very easy to use application specially designed to offer you a program for fitting structural models to small angle scattering data.

It can calculate integral structural parameters like radius of gyration, scattering invariant, Porod constant. Furthermore it can fit size distributions together with several form factors including different structure factors.

Additionally an algorithm has been implemented, which allows to simultaneously fit several scattering curves with a common set of (global) parameters. This last option is especially important in contrast variation experiments or measurements with polarised neutrons.

  • Platform: WinOther

Data is often given for discrete values along a continuum. However, you may require estimates at points between the discrete values. MathPad Curve Fitter describes techniques to fit curves to such data in order to obtain intermediate estimates. In addition, you may require a simplified version of a complicate function. One way to do this is to compute values of the function at a number of discrete values along the range of interest. Then a simpler function may be derived to fit these values. Both of these applications are known as curve fitting.

There are general approaches for curve fitting that are distinguished from each other on the basis of the amount of error associated with the data.

  • Platform: Win2000, Windows 7, WinOther, WinServer, WinVista

Fityk [fi:tik] is a program for data processing and nonlinear curve fitting.

It is primarily used

* by scientists who analyse data from powder diffraction, chromatography, photoluminescence and photoelectron spectroscopy, infrared and Raman spectroscopy, and other experimental techniques,

* to fit peaks bell-shaped functions (Gaussian, Lorentzian, Voigt, Pearson VII, bifurcated Gaussian, EMG, Doniach-Sunjic, etc.),

but any functions can be fitted to any 2D (x,y) data.

More dlT*
Features

* intuitive graphical interface (and also command line interface),
* support for many data file formats, thanks to the xylib library,
* dozens of built-in functions and support for user-defined functions,
* equality constraints,
* modelling error of the x...

  • Platform: WinOther

SimplexNumerica is an object-oriented numerical data analyzer, plot and presentation program. SimplexNumerica is proving to be extremely popular among scientists. Ergonomic programming using the newest Windows programming guidelines with toolbars, context dialogs and interactive diagrams providing easy handling with difficult numeric mathematics. SimplexNumerica is best suited for publication type graphics, analysis of arbitrary data, analysis of measuring data, etc..

  • Platform: Win7 x32, Win7 x64, WinVista, Windows 7 x64, Windows 10 x64

R-Linux is a data recovery and undelete utility for Ext2FS (Linux) file system. File recovery after power failure, system crash, virus infection or partition reformation, even for the different file system. Unformat and unerase tool. Creation of image files an entire disk, partition or its part. Such drive image can be processed like regular drive. Recognition and parsing of Dynamic (Windows 2000/XP), Basic and BSD (UNIX) partitions layout schema. Localized names support. Recovered files can be saved on any (including network) disks accessible by the host operating system..

  • Platform: Win2000, WinOther

Data Fitting: Freeware | All

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