Freeware Downloads for "Data Fitting Pdes"

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...

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..

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..

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.

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.

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.

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
  • Publisher: David Binner
  • Date: 03-01-2011

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.

  • Platform: Matlab, Scripts
  • Publisher: Nathaniel Brahms
  • Date: 13-05-2013
  • Size: 41 KB

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.

  • Platform: Windows
  • Publisher: RRR
  • Date: 24-03-2003
  • Size: 2487 KB

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
  • Publisher: MagicPlot.com
  • Date: 05-07-2012
  • Size: 2253 KB

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

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.

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
  • Publisher: Nikolai Chernov
  • Date: 05-03-2013
  • Size: 10 KB

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.

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.

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.

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.

  • Platform: WinOther
  • Publisher: Marcin Wojdyr
  • Date:
  • Size: 3205 KB

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..

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.

Ezy Data 2000 lets you easily create relational databases of tables and queries for entering, storing, viewing and analysing data. Many features include: . Import data from a spreadsheet or other database into Ezy Data. . Unlimited number of databases. Each database self-contained with a user-friendly Switchboard . Databases can be opened directly in MS Access 2000/2002/2003 . Over 40 pre-designed table templates . Wizards simplify query creation, data definition, and data integrity Download a fully-functional 30-day trial.

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