Thanks Scott, Matteo and Mollie very much.
My function is a little complicated, and composed by several sub-functions, so I did not attach it in the previcous mail. I will check  and try to simplify it, and then try more initial values.
Thanks very much 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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