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Fitting of Implicit, Nonlinear Functions

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Christoph
Christoph on 20 May 2013
Closed: MATLAB Answer Bot on 20 Aug 2021
Dear Matlab Experts,
I am taking current-voltage measurements of a photo-voltaic cell (j,V) and would now like to fit the resistance parameters Rs, Rp. Unfortunately the equation is implicit and all the fit functions I have used so far require explicit functions (I usually just use the cftool to fit my measurements).
j=j_0[exp(e(V-j*Rs)/(knT)-1]+(V-j*Rs)/Rp-j_L
As I am not very used to fitting in general every help is very welcome!
best wishes, Chris

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