Getting errors in fitnlm

I am trying to fit an equation fitnlm I am getting following errors and the data is fitting but not giving the desired values of coeffeceints. I have taken several values for first estimate of first coeffeceint.

Warning: The Jacobian at the solution is ill-conditioned, and some model parameters may not be

estimated well (they are not identifiable). Use caution in making predictions.

> In nlinfit (line 384)

In NonLinearModel/fitter (line 1127)

In classreg.regr/FitObject/doFit (line 94)

In NonLinearModel.fit (line 1446)

In fitnlm (line 99)

In PH307_assignment02_3 (line 26)

Thanks for help in advance. Sorry for inconvenience.

Answer 1

[Prateek Rai]

To my understanding, you are trying to fit an equation using fitnlm and getting "The Jacobian at the solution is ill-conditioned ..." warning message.

You can refer to the following MATLAB Answer, that provides detailed information on this warning.

[M. Sarim Ameed Khan]

Thank you very much