[R] Help Derivate for Nonlinear Growth Models

[acocac]

Hi!! Im doing my graduated work in Onion Curves Growth with Nonlinear Models,
I'm amateur in R so i have  doubt how i put or program next models,

http://r.789695.n4.nabble.com/file/n3236748/96629508.png 

Also, i cant derivate for Gauss Model, and Richard Model dont have funtion,
If someone could help me, i was so grate,


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