TaylUR, an arbitrary-order diagonal automatic differentiation package for Fortran 95

Details TaylUR, an arbitrary-order diagonal automatic differentiation package for Fortran 95 TaylUR, an arbitrary-order diagonal automatic differentiation package for Fortran 95

2005-06-29

arxiv.org/abs/physics/0506222v2

Comput.Phys.Commun. 174 (2006) 569-576

Physics

Computational Physics

16 pages, 8 figures, uses elsart.cls, version accepted for publication

Scientific paper

10.1016/j.cpc.2005.12.016

We present TaylUR, a Fortran 95 module to automatically compute the numerical values of a complex-valued function's derivatives w.r.t. several variables up to an arbitrary order in each variable, but excluding mixed derivatives. Arithmetic operators and Fortran intrinsics are overloaded to act correctly on objects of defined type "taylor", which encodes a function along with its first few derivatives w.r.t. the user-defined independent variables. Derivatives of products and composite functions are computed using Leibniz's rule and Faa di Bruno's formula. TaylUR makes heavy use of operator overloading and other object-oriented Fortran 95 features.

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