ZunZun.com 2D Function Finder Interface
Text Data Editor
Data Labels For Graphs
Equation Family Inclusion
Extended Equation Types
Please select an option from the pull-down menu above.
Most users should turn off the Polyfunctional family
of equations and set the Smoothness Control to a small value
to start, then increase the Smoothness Control value as needed.
Text data editor
Cut-and-paste text or edit data here
Convert commas to spaces (1,2,0,3 yields 1 2 0 3)
Use comma as decimal separator (1,203 = 1.203)
Remove commas from text (1,2,0,3 yields 1203)
Standard Unweighted Fitting: no weights required
Weighted Fitting: each data point requires a weight
This data is provided as an example, cut and paste as needed to model your data. All lines of text that do not begin with a number are ignored. Weighted fitting requires an additional number to be used as a weight when fitting. The site does not calculate any weights, which are used as: error = weight * (predicted - actual) You must provide any weights you wish to use. 5.357 0.376 5.457 0.489 5.797 0.874 5.936 1.049 6.161 1.327 6.697 2.054 6.731 2.077 6.775 2.138 8.442 4.744 9.769 7.068 9.861 7.104
Here you can select the desired fitting target.
Lowest sum of squared absolute error
Lowest sum of squared orthogonal distance
Lowest sum of squared relative error
Lowest sum of absolute value of absolute error
Lowest sum of absolute value of relative error
Lowest peak absolute value of absolute error
Lowest peak absolute value of relative error
Lowest Akaike Information Criterion
Lowest Bayesian Information Criterion
Data labels for graphs
Here you can enter the X and Y data labels to be printed on the report graphs.
Label for first independent data (X)
Label for dependent data (Y)
Select the maximum number of coefficients for the function finder.
Equations with fewer coefficients are generally smoother.
Equation Family Inclusion
Select families of equations to include in the function finder.
NOTE: Polyfunctionals are only used in absolute SSQ fitting.
Polyfunctional (Unweighted SSQ only)
Extended Equation Types Control
Select extended equation types to include in the function finder.
Standard equation types
Reciprocal extended types
Inverse extended types
Linear Growth extended types
Linear Decay extended types
Exponential Growth extended types
Exponential Decay extended types
Animated Gallery of Common Problems
The fitting source code for the site is at the
Google Code Repository
Download the latest release (version 10.5) as a
or as a
DWSIM has a plug-in
that allows the fitting code to run locally with a GUI
Superior quality PDF on practical curve fitting:
Fitting Models to Experimental Data
Excellent, and brief,
introduction to curve fitting