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  • Committer: Bazaar Package Importer
  • Author(s): Johannes Ring
  • Date: 2009-10-12 14:13:18 UTC
  • mfrom: (1.1.1 upstream)
  • Revision ID: james.westby@ubuntu.com-20091012141318-hkbxl0sq555vqv7d
Tags: 0.9.4-1
* New upstream release. This version cleans up the design of the
  function class by adding a new abstraction for user-defined
  functions called Expression. A number of minor bugfixes and
  improvements have also been made.
* debian/watch: Update for new flat directory structure.
* Update debian/copyright.
* debian/rules: Use explicit paths to PETSc 3.0.0 and SLEPc 3.0.0.

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demo/pde/nonlinear-poisson/cpp/NonlinearPoisson.ufl
 
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# Copyright (C) 2005 Garth N. Wells.
 
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# Licensed under the GNU LGPL Version 2.1.
 
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#
 
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# Modified by Harish Narayanan, 2009.
 
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#
 
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# The linearised bilinear form a(v, U) and linear form L(v) for
 
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# the nonlinear equation - div (1+u^2) grad u = f
 
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#
 
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# Compile this form with FFC: ffc -l dolfin NonlinearPoisson.form.
 
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element = FiniteElement("Lagrange", "triangle", 1)
 
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v  = TestFunction(element)
 
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du = TrialFunction(element)
 
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f  = Function(element)
 
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u  = Function(element)
 
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L  = inner(grad(v), (1 + u**2)*grad(u))*dx - v*f*dx
 
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a  = derivative(L, u, du)
 
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