Ufl

------------------

- New integral type custom_integral (``*dc``)
- Add analysis of which coefficients each integral actually uses to optimize assembly
- Improved svg rendering of cells and sobolevspaces in ipython notebook
- Add sobolev spaces, use notation "element in HCurl" (HCurl, HDiv, H1, H2, L2)
- Improved error checking of facet geometry in non-facet integrals
- Improved restriction handling, restricting continuous coefficients and constants is now optional
- Introduce notation from the Periodic Table of the Finite Elements (draft)
- Remove alias "Q" for quadrature element, use "Quadrature"
- New derivative type ReferenceGrad
- New discontinuous RT element
- New geometry types Jacobian, JacobianInverse, JacobianDeterminant
- New geometry types FacetJacobian, FacetJacobianInverse, FacetJacobianDeterminant
- New geometry types CellFacetJacobian, CellFacetJacobianInverse, CellFacetJacobianDeterminant
- New geometry types FacetOrigin, CellOrigin
- New geometry types CellCoordinate, FacetCoordinate
- New geometry types CellNormal, CellOrientation, QuadratureWeight
- Argument (and TestFunction, TrialFunction) now use absolute numbering f.number() instead of relative f.count()
- New syntax: integrand*dx(domain)
- New syntax: integrand*dx(1, domain=domain)
- New syntax: integrand*dx(1, subdomain_data=domain_data)
- Using domain instead of cell in many places.
- Deprecated notation 'cell.n', 'cell.x' etc.
- Recommended new notation: FacetNormal(domain)
- Experimental: Argument (and TestFunction, TrialFunction) now can have a specified part index for representing block systems
- Experimental: Domains can now be created with a Coefficient providing coordinates: Domain(Coefficient(VectorElement("CG", domain, 2)))
- Experimental: New concept Domain: domain = Domain(triangle, geometric_dimension=3, label="MyDomain")
- Various general optimizations
- Various minor bugfixes
- Various docstring improvements

------------------

- Add cell_avg and facet_avg operators, can be applied to a Coefficient or Argument or restrictions thereof
- Fix bug in cofactor: now it is transposed the correct way.
- Add cell.min_facet_edge_length
- Add cell.max_facet_edge_length
- Simplify 0^f -> 0 if f is a non-negative scalar value
- Add atan2 function
- Allow form+0 -> form

------------------

- NB! Using shapes such as (1,) and (1,1) instead of () for 1D tensor quantities I, x, grad(f)
- Add cell.facet_diameter
- Add new concept Domain
- Add new concept Region, which is the union of numbered subdomains
- Add integration over regions (which may be overlapping by sharing subdomains)
- Add integration over everywhere
- Add functions cosh, sinh, tanh, Max, Min
- Generalize jump(v,n) for rank(v) > 2
- Fix some minor bugs

------------------

- Add support for pickling of expressions (thanks to Graham Markall)
- Add shorthand notation A**2 == inner(A, A), special cased for power 2.
- Add support for measure sum notation f*(dx(0) + dx(3)) == f*dx(0) + f*dx(3)
- Supporting code for bugfix in PyDOLFIN when comparing test/trial functions
- Remove support for tuple form notation as this was ambiguous
- Bugfix in quadrature degree estimation, never returning <0 now
- Remove use of cmp to accomodate removal from python 3

1.1-alpha-prerelease (2012-11-18)
---------------------------------

(Not released, snapshot archived with submission of UFL journal paper)
- Support adding 0 to forms, allowing sum([a])
- Major memory savings and optimizations.
- Some bugfixes.
- Add perp operator.
- Support nested tuple syntax like MixedElement((U,V),W)
- Allow outer(a, b, c, ...) by recursive application from left.
- Add simplification f/f -> 1
- Add operators <,>,<=,>= in place of lt,gt,le,ge

------------------

- No changes since rc1.

--------------------

- Added tests covering snippets from UFL chapter in FEniCS book
- Added more unit tests
- Added operators diag and diag_vector
- Added geometric quantities cell.surface_area and cell.facet_area
- Fixed rtruediv bug
- Fixed bug with derivatives of elements of type Real with unspecified cell