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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