Special math functions module

This module features additional coefficient-wise math functions available within the numext:: namespace for the scalar version, and as method and/or free functions of Array. Those include:

• erf
• erfc
• lgamma
• igamma
• igamma_der_a
• gamma_sample_der_alpha
• igammac
• digamma
• ndtri
• polygamma
• zeta
• betainc

Bessel Functions

• bessel_i0
• bessel_i0e
• bessel_i1
• bessel_i1e
• bessel_j0
• bessel_j1
• bessel_k0
• bessel_k0e
• bessel_k1
• bessel_k1e
• bessel_y0
• bessel_y1

#include <unsupported/Eigen/SpecialFunctions>