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singularity
2010 Oct 13
2
Using NLS with a Kappa function
...= data1, :
singular gradient
I think these error results from the fact that I obtained a good fit with a
logistic function and that the Kappa reduces to a logistic in the limit with
k -> 0. This causes a problem because the Kappa function has a term raised
to (1/k)th power leading the numerical singularlity for low values of k.
(Since the logistic function gave a good fit, then I am sure that best fit
value for k is very small.) If so, this problem would intractable, but I
thought I see what response I got from other users before giving up on this
track.
Here are a few lines from the command line:
&...