ADIFOR 2.0 Automatic Differentiation of Fortran

A collaborative project between the Mathematics and Computer Science Division at Argonne National Laboratory and the Center for Research on Parallel Computation at Rice University.

The ADIFOR pages are mirrored both at the Mathematics and Computer Science Division of Argonne National Laboratory and the Center for Research on Parallel Computation at Rice University.

[ADIFOR Home Page at Argonne | ADIFOR Home Page at Rice]

[ Other AD related pages at Argonne ]

ADIFOR Overview & Applications

ADIFOR is a tool for the automatic differentiation of Fortran 77 programs. Given a Fortran 77 source code and a user's specification of dependent and independent variables, ADIFOR will generate an augmented derivative code that computes the partial derivatives of all of the specified dependent variables with respect to all of the specified independent variables in addition to the original result.

The ADIFOR 2.0 system offers the following features:

Full Fortran 77 Support

• For example, ADIFOR 2.0 supports common blocks, arbitrary subroutine calling sequences, COMPLEX arithmetic, FUNCTIONs and SUBROUTINEs, statement functions, or procedure parameters. In addition to these features, the ADIFOR 2.0 preprocessor also supports common extensions such as DOUBLE COMPLEX, INCLUDE statements, and IMPLICIT NONE.

Flexible Intrinsic Handler

• The ADIntrinsics 1.0 system, which is part of ADIFOR 2.0 provides for various reporting levels in response to exceptions such as the differentiation of sqrt(x) when x is zero, and can easily be customized through the use of template files.

Transparent Sparsity Support

• Code generated with ADIFOR 2.0 can perform derivative computations using the SparsLinC (Sparse Linear Combination) library, thus transparently exploiting sparsity arising in large sparse Jacobian computations or gradients of functions that have a sparse Hessian.

Applications of ADIFOR are described in a collection of short highlights.

ADIFOR Developers & Sponsors

ADIFOR is a collaborative project between the Mathematics and Computer Science Division at Argonne National Laboratory and the Center for Research on Parallel Computation at Rice University.

To contact all members of the ADIFOR development team at Argonne National Laboratory and Rice University, send email [email protected] or [email protected]. To contact the leaders of the ADIFOR project, send email to Paul Hovland ([email protected]) or Alan Carle ([email protected])

ADIFOR development has been funded by the Department of Energy, the National Aeronautics and Space Administration, and the National Science Foundation, through the Center for Research on Parallel Computation.

Chris Bischof and Alan Carle were awarded the Wilkinson Prize for Numerical Software in 1995 for their development of ADIFOR.

Thanks go to the following people who helped create the ADIFOR web pages:

• Jason Abate
• Debbie Campbell
• Fred Dilley
• Mike Fagan
• Larry Green
• Peyvand Khademi
• Andrew Mauer
• Gail Pieper

[ADIFOR Home Page at Argonne | ADIFOR Home Page at Rice]