Curve fitting of three curves to single equation

@narasimharao wrote:

I have extracted data from image and do some curve fitting. I tried manually Engauge Digitizer software to extract numeric data from image Files three curve's data .csv files. Now I can have three curve fitting from each csv file. Each curve are temperature dependent

Vce25 = a25*Ic + b25*log(Ic) + c25 ---(1) @ temperature Tvj=25C
Vce125 = a125*Ic + b125*log(Ic) + c125 ---(2) @ temperature Tvj=125C
Vce150 = a150*Ic + b150*log(Ic) + c150 ---(3) @ temperature Tvj=150C

Vce,Tc,Tvj are variables & a,b,c are constants how to find them?

I want to combine these three curves, coefficients can be made temperature-dependent to a single equation { Vce = f(Ic,Tvj) }. How to do thisi in R?

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