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[HG UFL] - Added partial differentiation rules for use with reverse mode AD.

To: ufl-dev@xxxxxxxxxx
From: ufl@xxxxxxxxxx (UFL)
Date: Tue, 6 Jan 2009 16:07:56 +0100 (CET)
Delivered-to: ufl-dev@xxxxxxxxxx

One or more new changesets pushed to the primary ufl repository.
A short summary of the last three changesets is included below.

changeset:   473:7c1f407255ca6ff82a43d553d42c8549cbb3fe01
tag:         tip
user:        "Martin Sandve AlnÃ¦s <martinal@xxxxxxxxx>"
date:        Tue Jan 06 16:07:53 2009 +0100
files:       ufl/algorithms/pdiffs.py ufl/conditional.py ufl/tensors.py
description:
- Added partial differentiation rules for use with reverse mode AD.

- Added unit_vector(i, d) and similar functions to tensors.py.

- Added sign(x) function, returning a conditional.


changeset:   472:b36bc7e317f08e79eb4f7f2e84f691c319b2dc6a
user:        "Martin Sandve AlnÃ¦s <martinal@xxxxxxxxx>"
date:        Tue Jan 06 12:38:29 2009 +0100
files:       ROADMAP ufl/algorithms/__init__.py ufl/algorithms/ad.py ufl/algorithms/analysis.py ufl/algorithms/graph.py ufl/algorithms/old_ad.py ufl/algorithms/transformations.py ufl/expr.py
description:
Added some code for working with computational graphs.


changeset:   471:cc05019c7c23a2f2bef8cf4f8531b64b5dd05dc1
user:        "Martin Sandve AlnÃ¦s <martinal@xxxxxxxxx>"
date:        Mon Jan 05 22:24:59 2009 +0100
files:       ufl/algorithms/__init__.py ufl/algorithms/analysis.py ufl/algorithms/checks.py ufl/algorithms/formtransformations.py ufl/algorithms/monomials.py ufl/algorithms/predicates.py ufl/algorithms/transformations.py
description:
Variable update and cleanup work on algorithms.

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For more details, visit http://www.fenics.org/hg/ufl