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I am trying to fit two data sets to a function model described below which share a few common parameters. Say I have two functions with some common parameter(s)

f[x_,y_]:= a*Exp[-x]*Sin[b*y] + c
g[x_,y_]:= d*Exp[-x]*Sin[b*y] + c

I generated two model data sets using a functional form similar to the ones above and tried to fit the data using NonlinearModelFit. But NonlinearModelFit fails to converge within the prescribed iterations and confidence interval.

I tried checking the threads (Combined fitting via NonlinearModelFit or http://forums.wolfram.com/mathgroup/archive/2011/Sep/msg00555.html or http://community.wolfram.com/groups/-/m/t/135933) on similar discussions but could not solve my problem. Any suggestions would be welcome.

Thanks in advance.



marked as duplicate by Oleksandr R., Karsten 7., Öskå, Jens, bobthechemist Dec 25 '14 at 3:55

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    $\begingroup$ Could you also add the code you tried for fitting the data using NonlinearModelFit. Did you try to use good starting values for the fit? $\endgroup$ – Karsten 7. Oct 21 '14 at 4:47

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