How to fit a impedance data using curve fitting?

Hello,

I've measurement data out of an impedance spectroscopy, which I need to fit within an physical model (using R, C, L). I've already tried Zfit from the file exchange, but the result is not quite good, probably because of not accurate inital conditions. Those inital conditions are quite difficult to determine. Therefore I was wondering if there is a possibility to fit the nyquist plot using the curve fitting toolbox?

Thanks!

Answer 1

[Michael Abboud]

You may find the following pages useful:

http://www.mathworks.com/help/optim/examples/nonlinear-data-fitting.html

http://www.mathworks.com/help/matlab/math/example-curve-fitting-via-optimization.html

However, the Zfit and ZfitGUI tools may still be your best bet given they are specifically made for this purpose and generally have great reviews. You can also consider reaching out to the author of these tools as he seems quite happy to respond to most comments.

If you are still having trouble, you can try including some sample data or code with your question so that others can explore further!