Psi function, also known as digamma function, is defined as

This function is calculated by Psi subroutine.

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C#

C# 1.0 source.
psif.csharp.zip - Psi function

C++

C++ source.
psif.cpp.zip - Psi function
ablas.zip - optimized basic linear algebra subroutines with SSE2 support (for C++ sources only)

Delphi

Delphi source.
Can be compiled under FPC (in Delphi compatibility mode).
psif.delphi.zip - Psi function

Visual Basic 6

Visual Basic 6 source.
psif.vb6.zip - Psi function

Zonnon ^beta

Zonnon source.
Zonnon is an experimental language developed at ETH Zurich.
See www.zonnon.ethz.ch for more information.
psif.zonnon.zip - Psi function