Description Usage Arguments Value Author(s)

The function that computes the gradient of the energy (or error)
of the deformation of the mesh from the flat outline to the
sphere. This depends on the locations of the points given in
spherical coordinates. The function is designed to take these as a
vector that is received from the `optim`

function.

1 |

`P` |
N-by-3 matrix of point coordinates |

`C` |
The connectivity matrix |

`L` |
Length of each edge in the flattened outline |

`T` |
Triangulation in the flattened outline |

`A` |
Area of each triangle in the flattened outline |

`R` |
Radius of sphere |

`alpha` |
Area penalty scaling coefficient |

`x0` |
Area penalty cutoff coefficient |

`nu` |
Power to which to raise area |

`verbose` |
How much information to report |

A vector representing the derivative of the energy of this particular configuration with respect to the parameter vector

David Sterratt

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