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Feature/cellwise constant

René Heß requested to merge feature/cellwise-constant into master

Make it possible to mark Expressions as cellwise const and put evaluation in pdelab outside the quadrature loop. Closes issue #27 (closed).

The implementation is kind of sketchy but I wanted to go to weekend. Some notes/TODO:

  • I had to add a statement to the ufl file. For cellwise const expressions a dg0 dummy space is used (-> cell wise const), else we use a dg1 space (in execution.py).
  • I now use 'default_declaration' from loopy.py for defining parameter objects.

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