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Student Support Forum: 'Nonlinear Curve Fitting - Singular Jacobian' topicStudent Support Forum > General > "Nonlinear Curve Fitting - Singular Jacobian"

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Rohan
05/21/12 10:50am

Hi,
I am trying to fit some experimental data to a Non-Linear model. I was able to do this, till I slightly modified my model, and now I get a singular jacobian error (FindRoot::jsing: Encountered a singular Jacobian at the point {ef} = {0.05}. Try perturbing the initial point(s). >>)

The weird thing is, this error is in FindRoot, and not in the NonLinearModelFit command. My model does include a variable (called ef), which is the result of a FindRoot command. However, when I just try to solve for ef using FindRoot, I am able to do so without trouble.

The notebook is attached. Also, I get an error that says {0.37433} is not a number. I guess this is a list of one element. How do I convert it to a number?
Thanks,
Rohan

Attachment: Iter-mod1.nb, URL: ,

Subject (listing for 'Nonlinear Curve Fitting - Singular Jacobian')
Author Date Posted
Nonlinear Curve Fitting - Singular Jacobian Rohan 05/21/12 10:50am
Re: Nonlinear Curve Fitting - Singular Jacobian Michael 05/23/12 2:23pm
Re: Re: Nonlinear Curve Fitting - Singular Jaco... Rohan 05/23/12 3:48pm
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