| s14acc | nag_polygamma_fun ψ (x) - ln x |
| s14adc | nag_polygamma_deriv Scaled derivatives of ψ (x) |
| s14aec | nag_real_polygamma Derivative of the psi function ψ (x) |
| s14afc | nag_complex_polygamma Derivative of the psi function ψ (z) |