Sphere.d_Phi_phi¶

Sphere.d_Phi_phi(r, theta, phi)¶

Derivative of the surface function considering the polar angle \(\phi\)

\[\begin{split}\frac{\partial\Phi}{\partial\phi}(r,\phi,\theta)= \begin{bmatrix}-r\sin(\phi)\sin(\theta)\\r\cos(\phi)\sin(\theta)\\0\end{bmatrix}\end{split}\]