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1.2.x [2013-??-??]
- 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
1.1.0 [2013-01-07]
- 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
1.0.0 [2011-12-07]
- No changes since rc1.
1.0-rc1 [2011-11-22]
- 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
1.0-beta3 [2011-10-26]
- Added nabla_grad and nabla_div operators
- Added error function erf(x)
- Added bessel functions of first and second kind, normal and modified,
bessel_J(nu, x), bessel_Y(nu, x), bessel_I(nu, x), bessel_K(nu, x)
- Extended derivative() to allow indexed coefficient(s) as differentiation variable
- Made *Constant use the 'Real' space instead of 'DG0'
- Bugfix in adjoint where test and trial functions were in different spaces
- Bugfix in replace where the argument to a grad was replaced with 0
- Bugfix in reconstruction of tensor elements
- Some other minor bugfixes
1.0-beta2 [2011-08-11]
- Support c*form where c depends on a coefficient in a Real space
1.0-beta [2011-07-08]
- Add script ufl-version
- Added syntax for associating an arbitrary domain data object with a measure:
dss = ds[boundaries]; M = f*dss(1) + g*dss(2)
- Added new operators elem_mult, elem_div, elem_pow and elem_op for
elementwise application of scalar operators to tensors of equal shape
- Added condition operators And(lhs,rhs) and Or(lhs,rhs) and Not(cond)
- Fixed support for symmetries in subelements of a mixed element
- Add support for specifying derivatives of coefficients to derivative()
0.9.1 [2011-05-16]
- Remove set_foo functions in finite element classes
- Change license from GPL v3 or later to LGPL v3 or later
- Change behavior of preprocess(), form.compute_form_data(), form_data.preprocessed_form
- Allowing grad, div, inner, dot, det, inverse on scalars
- Simplify Identity(1) -> IntValue(1) automatically
- Added Levi-Cevita symbol: e = PermutationSymbol(3); e[i,j,k]
- Fix bug with future division behaviour (ufl does not support floor division)
- Add subdomain member variables to form class
- Allow action on forms of arbitrary rank
0.9.0 [2011-02-23]
- Allow jump(Sigma, n) for matrix-valued expression Sigma
- Bug fix in scalar curl operator
- Bug fix in deviatoric operator
0.5.4 [2010-09-01]
- Bug fixes in PartExtracter
- Do not import x for coordinate
- Add Circumradius to Cell (Cell.circumradius)
- Add CellVolume to Cell (Cell.volume)
0.5.3 [2010-07-01]
- Rename ElementRestriction --> RestrictedElement
- Experimental import of x from tetrahedron
- Make lhs/rhs work for resrictions
- Redefine operator + for FiniteElements and replace + by *
- Rename ElementUnion -> EnrichedElement
- Add support for tan() and inverse trigonometric functions
0.5.2 [2010-02-15]
- Attach form data to preprocessed form, accessible by form.form_data()
0.5.1 [2010-02-03]
- Fix bug in propagate_restriction
0.5.0 [2010-02-01]
- Several interface changes in FormData class
- Introduce call preprocess(form) to be called at beginning of compilation
- Rename BasisFunction --> Argument
- Rename Function --> Coefficient
0.4.1 [2009-12-04]
- Redefine grad().T --> grad()
- New meaning of estimate_max_polynomial_degree
- New function estimate_total_polynomial_degree
- Allow degree = None and cell = None for elements
0.4.0 [2009-09-23]
- Extensions for ElementRestriction (restrict FiniteElement to Cell)
- Bug fix for lhs/rhs with list tensor types
- Add new log function set_prefix
- Add new log function log(level, message)
- Added macro cell integral *dE
- Added mechanism to add additional integral types
- Added LiftingOperator and LiftingFunction
- Added ElementRestriction
0.3.0 [2009-05-28]
- Some critical bugfixes, in particular in differentiation.
- Added form operators "system" and "sensitivity_rhs".
- diff can take form as argument, applies to all integrands.
- Rudimentary precedence handling for better
use of parentheses in str(expression).
- Added script ufl2py, mainly for debugging purposes.
- Crude implementation of estimate_max_polynomial_degree
for quadrature degree estimation.
- Improved manual.
0.2.0 [2009-04-07]
- Initial release of UFL.
0.1.0 [...]
- Unreleased development versions of UFL.
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