
Are you an engineer, scientist or graduate student looking for a graphing tool that will allow you to quickly analyze graphed data without having to immerse yourself into calculus and statistics books? You've just found the perfect solution. FindGraph is a comprehensive, featurerich graphing, digitizing and curve fitting software specially created for these purposes. Take any graph or data from any source (Web or PDF document, for example) add your comments and perform any manipulations, like building approximation lines. Then print your results or export them to Excel or other database. The program comes with a straightforward interface, 200 builtin common graphing functions (like Cardioid, Devil's Curve, or Double Folium), support for Polar, Cartesian, and Parametric equations, various data input/export features and printing options.
Builtin Wizard of Digitization will help you to digitize the data. One of the major features FindGraph provides is an easy way to do curve fitting. The program offers 10 generic fits, including Linear Regression, Logistic Functions, Fourier approximation, Neural Networks plus a library of over 120 industryspecific formulas. Builtin Wizard of Approximation helps applying different curve fits to discover the model that describes data the best. The software also enables users to smooth, subtract, differentiate, integrate, and transform data and curves.
Most importantly, FindGraph provides an easy way to copy and paste (embed) graphs to other software applications, like word processors, MS Excel or image editors. Moreover, the program supports OLE automation and can be builtin to other software applications. Best of all, FindGraph is free to try. You can test the software at no charge for the entire length of trial period  30 Days! If you have any questions about implementing the software in your classroom or want to inquire about special low prices for academic institutions, don't hesitate to contact us.
math graph curve fitting equation chart plotting visualize digitizing drawing functions


SimplexNumerica is an objectoriented 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.
plotting diagram plot numeric charts data logging data analyzer data analysis curve fitting plotting software numerical mathematics


vCalc is a keyboard driven scientific calcualtor,
that works using the RPN notation common in well
known scientific calculators. It supports a complete
set of math, binary and statistical operations.
* Keyboard driven user interface
* Four basic operations on integer and floating point numbers
* 100 memory registers with a real time watch capability
* Exponent, Square Root, %, %T, and Delta %
* Sine, Cosine, Tangent, and their inverses
* Log and antilog in bases 10, e, and 2.
* Floor, Ceiling, Truncate, Round, and Absolute Value
* Factorial/Gamma Function
* 1 and 2 variable statistics with multiple concurrent datasets
* Mean, Standard Deviation, Covariance, Population Covariance, Sum
* Curve Fitting (Linear, Logarithmic, Exponential, and Power)
* Support for 64bit integer math with bitwise AND, OR, XOR, and NOT
* Display and entry of integers in decimal, hexadecimal, and octal
* Save and Load to disk
* Clipboard Cut, Copy, and Paste
* IEEE754 compliant math
vcalc rpn keyboard scientific statistical calculator rpn scientific calculator statistics binary


Data: Import data series from database (MS Access) table, text file, copy/paste from spreadsheet (MS Excel). Operate with more then one data series at the same time. Virtually unlimited number of records to present and analyze. Automatically recognize calendar mm/dd/yyyy data format transferring it into yyyy.yyyy to use for market (currencies, shares, commodities) time trend analyzation. Data presentation and statistical analysis: Histograms of variables distribution and comparison with Student and Poisson curves.XY chart of two variable dependence and curve fitting with least square method (variety of user interfaces to chose from), signals revealing and user defined formula. Automatically best polynomial and Fourie approximation. Three dimensional in perspective projection presentation of variable as function of two arguments and distribution of two variables. Color map style presentation of function of two arguments and distribution of two variables. Quasi plane and parabolic least square approximation in multidimensional space of arguments (including case of two arguments where the fitting surfaces are visualized. Nearest neighbors method of estimation value in multidimensional space. A matrix of correlation coefficients of active variables. Results: Data and main statistical results is displayed on the screen in reportready form. Statistical formulas and coefficients are shown in result panel. User has ability to copy/paste screen chart as a bitmap picture into MS Office applications as well a content of result panel in form of a table. There is an option to instantly create a MS Word document with a picture and results reflected to the content of chart screen and content result control. Interface: Transparent and selfexplanatory user interface conveniently located at control panel of application. At any moment a user via at most three clicks is able to reach any control to edit a statistical schemes or presentation options.
distribution approximation curve fitting least square near neighbors statistic software statistical analysis experimental data


DataFit is a tool used to perform nonlinear regression (curve fitting), statistical analysis and data plotting. What sets DataFit apart from similar curve fitting and regression programs is its ease of use. DataFit is driven by a welldesigned graphical interface, so there are no complicated instructions to remember and no programs to write. Data entry is achieved through a standard spreadsheet interface, which supports ASCII and ODBC data source import, as well as cutting and pasting data from the clipboard. With DataFit, you can perform linear or nonlinear regression on data containing up to 20 independent variables. You can choose from more than 600 predefined equations, which are commonly used in statistical, scientific and engineering applications, or create your own equations. Solved equations are sorted according to goodnessoffit. DataFit also includes forward selection, backward elimination, stepwise selection and manual variable selection modes to help determine which independent variables should be included in your regression model for multivariate datasets. Results include completely customizable 2D and 3D plots, fitted parameters with confidence intervals, input vs. estimated data and goodnessoffit information. Plots can be saved as templates, which allows them to be applied to new plots in order to instantly give them your own custom appearance. Data tables, supporting interpolation and extrapolation (projections), can be exported in ASCII, Excel or HTML format. You can also automatically export source code in BASIC or C to utilize any solved equation in a program that you have written. Macro capability allows curve fitting operations to be performed nongraphically, either in batch mode or by calling DataFit from an external program. With the combination of an intuitive interface, online help and wide range of features, it is a tool that is used effectively by both beginners and experts.
curve fitting data plotting nonlinear parameter estimation regression statistics math science


NLREG performs nonlinear regression and curve fitting. NLREG fits a mathematical function whose form you specify to a set of data values. Virtually any type of function can be fitted. NLREG includes a programming language similar to C that you use for describing the function to be fitted. Two dimensional line and three dimensional surface plots can be generated. The programming language includes a large selection of builtin library functions (sin, cos, log, exp, etc.) that makes it easy to describe complicated models.
nonlinear regression curve fitting regression modeling surface fitting nlreg performs nonlinear regression curve fitting


Excel addin with eleven powerful worksheet functions for 1, 2 and 3 variable lookup and interpolation. Interpolation modes include: closestvalue, linear, piecewise parabolic or hyperbolic, cubic spline and polynomial up to 20th order. The functions can also handle tables containing missing and invalid data.
Includes functions to fit polynomial curves through a set of XY data points and return a table of polynomial curve coefficients, as well as, determine the best fit polynomial curve.
In case of an error, TriLookup functions can either return a standard Excel error code or a detailed text error message, indicating the nature of the error and pointing to the cause of it.
Includes online help and example workbooks. Requires Microsoft Excel 97, 2000, XP or 2003 (Windows) or Excel 98, 2001 or X (Mac).
TVLOOKUP & TVLKP search a multi column table for the lookup value in the lookup column and return a value from the same row of the return column. Can use interpolation and handle missing values.
THLOOKUP & THLKP search a multi row table for the lookup value in the lookup row and return a value from the same column of the return row. Can use interpolation and handle missing values.
T2LOOKUP & T2LKP search a 2D (XY) table for X values in top row and Y values in left column, and return a value from the intersecting row and column. Can use interpolation and handle missing values.
T3LOOKUP & T3LKP search a 3D (XYZ) table for X, Y and Z values. Return a value V(x,y,z) from the intersecting row, column and table. Can use interpolation and handle missing values.
TVPOLYDATA & THPOLYDATA Calculate polynomial curve coefficients up to a specified order (using the least squares method) for the XY data points given in a table. Also determine the best fit curve.
TPOLY returns the Y value of a polynomial curve for given a X value, polynomial order and an array of polynomial curve coefficients. It can optionally return the value of a derivative.
excel addin spreadsheet lookup interpolation curve fitting advanced 1 2 3 variable lookup


Excel addin with eleven powerful worksheet functions for 1, 2 and 3 variable lookup and interpolation. Interpolation modes include: closestvalue, linear, piecewise parabolic or hyperbolic, cubic spline and polynomial up to 20th order. The functions can also handle tables containing missing and invalid data.
Includes functions to fit polynomial curves through a set of XY data points and return a table of polynomial curve coefficients, as well as, determine the best fit polynomial curve.
In case of an error, TriLookup functions can either return a standard Excel error code or a detailed text error message, indicating the nature of the error and pointing to the cause of it.
Includes online help and example workbooks. Requires Microsoft Excel 97, 2000, XP or 2003 (Windows) or Excel 98, 2001 or X (Mac).
TVLOOKUP & TVLKP search a multi column table for the lookup value in the lookup column and return a value from the same row of the return column. Can use interpolation and handle missing values.
THLOOKUP & THLKP search a multi row table for the lookup value in the lookup row and return a value from the same column of the return row. Can use interpolation and handle missing values.
T2LOOKUP & T2LKP search a 2D (XY) table for X values in top row and Y values in left column, and return a value from the intersecting row and column. Can use interpolation and handle missing values.
T3LOOKUP & T3LKP search a 3D (XYZ) table for X, Y and Z values. Return a value V(x,y,z) from the intersecting row, column and table. Can use interpolation and handle missing values.
TVPOLYDATA & THPOLYDATA Calculate polynomial curve coefficients up to a specified order (using the least squares method) for the XY data points given in a table. Also determine the best fit curve.
TPOLY returns the Y value of a polynomial curve for given a X value, polynomial order and an array of polynomial curve coefficients. It can optionally return the value of a derivative.
excel addin spreadsheet lookup interpolation curve fitting advanced 1 2 3 variable lookup


The LAB Fit is a software for Windows developed for treatment and analysis of experimental data. At LABFit program you are able to:
1) Treat similar data (grouped and ungrouped dataset, one or two samples);
2) Treat nonsimilar data;
3) Determine propagated error (error propagation up to eight independent variables);
4) Plot 2D and 3D graph (normal, parametric, imported dataset, contour of maps);
5) Execute math calculations (system of linear equations, roots of function, nonlinear equation, ordinary differential equation  ODE up to fifth order, system of differential equations  up to five first order ODE, calculator, etc);
6) Extract data (x;y) from a 2D graph (digitizing);
7) Curve Fit (almost 500 functions at the library, with 1 and 2 independent variables, functions finder, option that let you write the fit function, rejection of data, confidence and prediction bands).
The LAB Fit has a menu for curve fitting and the main programs of this menu use nonlinear regression. The LABFit fits functions of one and several independent variables (from 1 up to 6), admitting uncertainties at the dependent variable (Y) and also at the independent variables (X). At the LAB Fit library there are more than 200 functions of one independent variable and almost 280 functions with two independent variables. The user disposes of a finder functions program. If necessary, there is an option so that the user can write its own fit function. Once determined the fit parameters, it's possible to extrapolate the fit function and, for the 2D and 3D cases, the graph of the obtained function is shown. For the 2D case, beyond the extrapolation possibility, the user can even include error bars and confidence bands to the graph. The LAB Fit has also a menu destined to the treatment of similar data, nonsimilar data and error propagation. Beyond that, there is a third menu with general tools like to plot a function informed by user.
curve fitting multiple regression error propagation nonlinear multivariate 2d 3d graph math tools graph and plot digitizer digitizing ode curve fitting


