Tool: CurvFit 


Go to:  http://fortrancalculus.info/apps/curvfit.html (opens a new window)  
Description:  CurvFit (tm) is a nonlinear curve fitting program. Sine, damped Sine, Lorentz, Modified Lorentz, Power (ie Polynomial) and Exponential series are presently available models to match your data. We strongly suggest trying a Lorentz series for data with multiple peaks or valleys. A calculator exists for interpolation &/or extrapolation of given data. CurvFit has proven excellent for hard to fit data. Hard to fit data may take more time but it can be done given the right series and parameter values. For start try curve fitting your data with a Lorentz series! A Lorentz function equals 1 / (1 + a x2). This is a shortened form of the infinite series inverse (1 + Σ ai x2i). For practical purposes the shortened Lorentz function is accurate enough. The Lorentz function equals the derivative of the arctangent. A Modified Lorentz function equals (1 + x) / (1 + a x2) = (1 + x) * Lorentz function! Use the modified Lorentz when minimizing number of terms in your curve fit series. (Someone suggested that the modified Lorentz is a Bessel function, is it?) Fitting Sinusoidal data is possible too. 

Technology Type:  Computer  
Author:  Optimal Designs Enterprise  
Language:  English  
Cost:  Does not require payment for use  
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Courses:  Algebra  Quadratic Systems, Exponential Functions  
Algebra II  Exponential Functions, Sequences and Series  
Trigonometry  Trig Functions, Series  
PreCalculus  Functions, Sequences and Series  
Calculus  Functions, Graphs, and Limits  
