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[Garth Wells <question137463@xxxxxxxxxxxxxxxxxxxxx>]

Question #137463 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/137463

    Status: Open => Answered

Garth Wells proposed the following answer:
I get machine precision using the quadrature representation for the code
generation. Just add

    parameters["form_compiler"]["representation"] = "quadrature"

somewhere near the top of the file.

The tensor contraction representation must be introducing round-off
errors (which are not helped using
parameters["form_compiler"]["precision"] ).

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