On 7/14/24 06:24, Chayapol Chaoveeraprasit wrote:
When I compiled the code, there was one error: 'SparseVanka<double> has no
member named 'clear'. In instantiation of 'void
dealii::MGLevelObject<Object>::clear_elements() [with Object =
dealii::SparseVanka<double>]', required from 'void
dealii::MGSmootherPrecondition<MatrixType, PreconditionType,
VectorType>::clear()...
It seems that the SparseVanka class has no clear() method, which is required
by MGLevelObject. I speculate that SparseVanka is not ready to be used as
multigrid smoother yet, or this is not the correct way to use SparseVanka as
multigrid smoother.
Chayapol:
It's possible that nobody has ever used SparseVanka as a preconditioner and
that as a consequence nobody has ever needed the clear() function. But I
suspect it would not be very difficult to implement such a function -- just
take a look at how it is implemented for the other classes typically used as
preconditioners, and see if you can add it to the SparseVanka class as well.
Would you like to see whether you can write such a patch, and contribute it to
the library? We would of course be very happy to give you feedback on your patch!
You might be interested in some of the material here (and linked to from here)
to see what it takes to create patches:
https://dealii.org/participate.html
https://github.com/dealii/dealii/wiki/Contributing
Best
W.
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