Read Gamry DTA files from Gamry Framework.You should have received a copy of the GNU General Public License along with this program. See the GNU General Public License for more details. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, in the version 3. If you have more algorithm suggestions, let me know. More fitting functions will be available in the future (such as Levenberg-Marquardt, Nelder-Mead, BFGS, Powell). Zfit is from Jean-Luc Dellis, available here. Screenshotsįminsearchbnd by John D'Errico is found here. Read the source of the file Zfit.m for full documentation about circuit string formatting. ToDo: Click the "load" button next to the fit string to load some predefined circuit examples. is incorrect.) The correct way is R1, R1 and R1. Careful! Do not treat elements as labels (i.e. A CPE has two parameters and therefore is written as E2. A resistance has one fitting parameter and therefore it is R1. All elements must include the number of fitting parameters. Elements can be connected in series as s(R1,R1) or in parallel as p(R1,R1) with as many elements as you want. DTA files are from Gamry Instruments (tested Gamry 1000 Interface)Īt the moment, circuits can be written according to the Zfit specification:.CSV files must have three columns: FREQ,REAL,IMAG.Save the results with the button 'Save as.'.Write your circuit in the dialog (based on Zfit format).Add CSV or DTA data with the button 'Add files.'.Run 'eistoolbox.m' to start the main program! The toolbox is currently under active development. This parameter describes how well the fitted data adjusts to the original measured data. The goal is to calculate the optimal circuit elements using standard minimization functions, such as the complex nonlinear least-squares method.Īfter obtaining the best fit, the toolbox also estimates the chi-square Goodness-of-Fit. Eistoolbox is a toolbox for MATLAB(R) used for batch fitting Electrochemical Impedance Spectroscopy (EIS) data to equivalent circuit models.
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