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  Dr Shaun Forth                 
  Applied Mathematics & Operational Research
  Engineering Systems Department
  Cranfield University, Shrivenham Campus
  Swindon SN6 8LA,  England
  tel.: +44 (0)1793 785311  
  fax.: +44 (0)1793 784196 
  email: S.A.Forth@cranfield.ac.uk
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  http://www.rmcs.cranfield.ac.uk/amor
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-----Original Message-----
From: org-ad-workshop-bounces@lists.rwth-aachen.de [mailto:org-ad-workshop-bounces@lists.rwth-aachen.de] On Behalf Of Christian Bischof
Sent: Wednesday, December 14, 2005 3:06 PM
To: Organizers AD Workshop
Subject: [Org-ad-workshop] [Fwd: Fagan Abstract for ICCS submission]

-------- Original Message --------

Subject:	Fagan Abstract for ICCS submission
Date:	Wed, 14 Dec 2005 08:59:55 -0600
From:	Mike Fagan <mfagan@cs.rice.edu>
Reply-To:	mfagan@cs.rice.edu
To:	Jean Utke <utke@mcs.anl.gov>, Christian Bischof <bischof@rz.rwth-aachen.de>

Jean and Chris,

Below is a short title+abstract for my ICCS submission. I will supply 
full paper late tomorrow (15 Dec 05).

Thanks for your patience.

Best,
Mike

P.S. Would 1 of you please email me when you get this? I have gotten a 
little paranoid about Rice email.
TIA

--------------- Fagan Title+Abstract for ICCS 2006 Submission ---------
Title: Derivatives by address for Fortran 77

Abstract:

   Automatic differentiation tools use 1 of 2 strategies to access
   derivative values. These strategies are:

      1) By-address
      2) By-name

   The by-address method is typically implemented by introducing
   structured types for each active scalar type. For example,
   scalar type 'real' will have an associated structure type
   'active-real'. Using this strategy, all active variables
   types are changed to the associated structured type.

   On the other hand, the by-name method introduces an associated
   new variable for each active variable. For example, the derivatives
   associated with 'pressure' would be 'd_pressure'.

   Since the by-address strategy employs structured types, AD tools
   for Fortran 77 have not employed that strategy. In this paper, we
   show how to use array access to implement the by-address strategy
   for Fortran 77. We discuss the canonicalization issues, outline our
   Adifor3.0 implementation of this technique, and give a few sample
   performance comparisons of the by-address vs the standard Adifor3.0
   by-name.

--

Prof. Christian Bischof, Ph.D.

Institute for Scientific Computing and Center for Computing and Communications

RWTH Aachen University

Seffenter Weg 23, 52074 Aachen, Germany

Tel. +49-241-8029110, Fax +49-241-8022241

bischof@rz.rwth-aachen.de, www.sc.rwth-aachen.de, www.rz.rwth-aachen.de