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Michał Wichrowski
Oct 12, 2019, 8:06:18 AM10/12/19
to deal.II User Group
Dear all,
The documentation of Chebyshev precondition says that:
"Note that if the degree variable is set to zero, the Chebyshev iteration corresponds to a Jacobi preconditioner"
while actually setting degree to 0 triggers Assertion at line 2211 of precondition.h. Moreover, the PreconditionChebyshev works well with degree=0 in release mode, so I think removing assetion will resolve the problem.
If Chebyshev preconditioner is not intended to be used with 0th degree this should be added to documentation (and documentation in current form is missleading)
Best,
MIchaĺ
Daniel Arndt
Oct 12, 2019, 8:29:23 AM10/12/19
to dea...@googlegroups.com
MIchaĺ,
The documentation in the developer version or the current version (https://www.dealii.org/developer/doxygen/deal.II/classPreconditionChebyshev.html) says:
"[...] Note that if the degree variable is set to one, the Chebyshev iteration corresponds to a Jacobi preconditioner (or the underlying preconditioner type) with relaxation parameter according to the specified smoothing range. [...]"
and the assertion is at line 2211 only in the developer version. The text you are referring to can be found in version 9.0.0.
Best,
Daniel
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Michał Wichrowski
Oct 12, 2019, 9:08:01 AM10/12/19
to deal.II User Group
W dniu sobota, 12 października 2019 14:29:23 UTC+2 użytkownik Daniel Arndt napisał:
MIchaĺ,The documentation in the developer version or the current version (https://www.dealii.org/developer/doxygen/deal.II/classPreconditionChebyshev.html) says:"[...] Note that if the degree variable is set to one, the Chebyshev iteration corresponds to a Jacobi preconditioner (or the underlying preconditioner type) with relaxation parameter according to the specified smoothing range. [...]"and the assertion is at line 2211 only in the developer version. The text you are referring to can be found in version 9.0.0.Best,Daniel
You're right, I was following wrong version of documentation. Thanks
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