Hi, all
I want to estimate four parameters using function mle2 (package bbmle). An error produced as follows:
>Error in optim(par = c(10, 0.01, 0.1, 0), fn = function (p)  : 
>initial value in 'vmmin' is not finite
 
At first,I thought it might be the problem of improper initial values. Then I changed the initial values many times, but could not get the final result. Sometimes, error produced as follows:
>Error in optim(par = c(100, 1, 0.1, 0.1), fn = function (p)  : 
>non-finite finite-difference value [4]
And sometimes, error message was the same as that produced in the first time (initial value in 'vmmin' is not finite).
 
I have searched in http://www.rseek.org/, but stil can not solve my problem. Do I need to change the initial values again and again or do something else?
 
Thanks for your attention and best wishes for you!
 
Guojun Lin
South China Botanical Garden, Chinese Academy of Sciences, China
Department of Renewable Resources, University of Alberta, Canada
 
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