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[Joachim Haga <jobh+launchpad@xxxxxxxxx>]

Public bug reported:

Code such as

M = collapse(C*B)
prec = ML(M)

crashes with a memory access error.

It seems like EpetraExt.Multiply returns a malformed Epetra matrix when
B and C are rectangular matrices, which then ML chokes on. This used to
work with older Trilinos releases.

I will investigate further as time allows, but for now let's call it a
known problem.

Example code: demo/navierstokes.py

** Affects: cbc.block
     Importance: Undecided
     Assignee: Joachim Haga (jobh)
         Status: New

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https://bugs.launchpad.net/bugs/1063737

Title:
  Crash with explicit matrix multiplies in trilinos

Status in Block operators and algebra for DOLFIN:
  New

Bug description:
  Code such as

  M = collapse(C*B)
  prec = ML(M)

  crashes with a memory access error.

  It seems like EpetraExt.Multiply returns a malformed Epetra matrix
  when B and C are rectangular matrices, which then ML chokes on. This
  used to work with older Trilinos releases.

  I will investigate further as time allows, but for now let's call it a
  known problem.

  Example code: demo/navierstokes.py

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