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.
Fcart(P, C, L, T, A, R, alpha = 1, x0, nu = 1, verbose = FALSE)N-by-3 matrix of point coordinates
The connectivity matrix
Length of each edge in the flattened outline
Triangulation in the flattened outline
Area of each triangle in the flattened outline
Radius of sphere
Area penalty scaling coefficient
Area penalty cut-off coefficient
Power to which to raise area
How much information to report
A vector representing the derivative of the energy of this particular configuration with respect to the parameter vector