_D_calc

miepython.mie_jit._D_calc(m, x, N)

Compute the logarithmic derivative of ψ_n(z) using the best method.

D_n(z) = d[log ψ_n(z)] = ψ_n’(z)/ψ_n(z)

here ψ_n(z) is the Riccati-Bessel function of the first kind ψ_n(z)=z*j_n(z) were j_n(z) is the spherical Bessel function of order n.

The zero-based array, D[:], is shifted so that D[0] = D₁(z) = ψ₁’(z)/ψ₁(z)

Parameters:

• m – the np.complex128 index of refraction of the sphere

• x – the size parameter of the sphere

• N – order of Ricatti-Bessel function

Returns:

Array of logarithmic derivatives D_k(z) for k=1 to N-1.