Sphere.d_Phi_theta¶

Sphere.d_Phi_theta(r, theta, phi)¶

Derivative of the surface function considering the azimuthal angle \(\theta\)

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