Implements some self starting rules for the beta growth function as desribed by Yin et. al (2003). This is equation 2.5 in the paper referenced below (Archontoulis and Miguez).

1 |

`time` |
a numeric vector of values at which to evaluate the model. This is typically expressed in some measure of time. |

`w.max` |
A numeric parameter representing the maximum weight (or biomass). |

`t.e` |
A numeric parameter representing the time at which maximum weight is attained (w.max). |

`t.m` |
A numeric parameter representing the time at which the inflection point of the curve is attained. The maximum growth rate ocurrs at this time. |

returns a numeric vector of the same length as the input

Fernando E. Miguez

Yin, X., J. Goudriaan, E.A. Lantinga, J. Vos, and J.H.J. Spiertz. 2003b. A flexible sigmoid function of determinate growth. Annals of Botany 91: 361–371. (with erratum in Annals of Botany 91: 753, 2003).

Nonlinear Regression Models and Applications in Agricultural Research. Sotirios V. Archontoulis and Fernando E. Miguez. Agronomy Journal. doi: 10.2134/agronj2012.0506

1 | ```
## See the vignette for an example
``` |

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