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[Garth Wells <706330@xxxxxxxxxxxxxxxxxx>]

Could it be an issue that PETScMatrix is a subclass of PETScBaseMatrix
as well as GenericMatrix? (in terms of the SWIG wrappers)

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https://bugs.launchpad.net/bugs/706330

Title:
  PETScMatrix doesn't work properly from Python

Status in DOLFIN:
  Confirmed

Bug description:
  Some Python demos (e.g. la/eigenvalue/python) are failing because of a
  problem with the use of PETScMatrix (Matrix seems to be fine).

  The error during assembly is weird:

  python: /home/garth/code/fenics/dolfin.d/dolfin-
  all/dolfin/la/PETScMatrix.cpp:271: virtual void
  dolfin::PETScMatrix::setrow(dolfin::uint, ....

  PETScMatrix::setrow shouldn't be called. Is there a problem with the
  SWIG typemaps (that is't trying to copy data)?