[ADMB Users] Error message

John Sibert sibert at hawaii.edu
Wed Jan 30 15:48:14 PST 2013

Dave is correct and Mollie's suggestion to put bounds on x is a good one.

However the troublesome question is why you did not get a divide by zero 


John Sibert
Emeritus Researcher, SOEST
University of Hawaii at Manoa
Honolulu HI (GMT-10)

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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