The error msg says it all if you know how to read it.
> When I run the optimization (given that I can't find parameters that
> fit the data by eyeball), I get the error:
> ```
> Error in chol.default(object$hessian) :
> the leading minor of order 1 is not positive definite
Your Jacobian (deriv
> On May 5, 2018, at 1:19 AM, Troels Ring wrote:
>
> Dear friends - I'm having troubles with nlme fitting a simplified model as
> shown below eliciting the error
>
> Error in chol.default((value + t(value))/2) :
> the leading minor of order 1 is not positive definite -
>
> I have seen the t
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