[ADMB Users] Error message

[Hai Che]

Dear all, thank you for helping with this issue. I have tried and resolved
this. Many thanks!

Hai


On Thu, Jan 31, 2013 at 7:48 AM, John Sibert <sibert at hawaii.edu> wrote:

> Dave is correct and Mollie's suggestion to put bounds on x is a good one.
> http://www.derivative-**calculator.net/#expr=sqrt%28x%**29<http://www.derivative-calculator.net/#expr=sqrt%28x%29>
>
> However the troublesome question is why you did not get a divide by zero
> error.
>
> John
>
> John Sibert
> Emeritus Researcher, SOEST
> University of Hawaii at Manoa
> Honolulu HI (GMT-10)
> 808-294-3842
>
> Visit the ADMB project http://admb-project.org/
>
>
> On 01/29/2013 07:49 PM, Hai Che wrote:
>
>> Dear all,
>>
>> I kept getting the error message:
>>
>> Attempting to take the derivative of sqrt(prevariable x) at x=0
>>
>> after 30-40 iterations using ADMB. I tried different starting values and
>> etc. Nothing helped. Could you help providing some suggestions on this
>> problem?
>>
>> Hai
>>
>>
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>>
>
>
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