Jacobi's elliptic functions sn(u|m), cn(u|m), dn(i|m) and φ(u|m) are defined by using the incomplete elliptic integral of the first kind:

JacobianEllipticFunctions subroutine calculates these functions using arithmetic-geometric mean algorithm.

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C#

C# 1.0 source.
jacobianelliptic.csharp.zip - Jacobian elliptic functions

C++

C++ source.
jacobianelliptic.cpp.zip - Jacobian elliptic functions
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).
jacobianelliptic.delphi.zip - Jacobian elliptic functions

Visual Basic 6

Visual Basic 6 source.
jacobianelliptic.vb6.zip - Jacobian elliptic functions

Zonnon ^beta

Zonnon source.
Zonnon is an experimental language developed at ETH Zurich.
See www.zonnon.ethz.ch for more information.
jacobianelliptic.zonnon.zip - Jacobian elliptic functions