Dear all,
I found out that calling
MGTransferBlockMatrixFree< dim, Number > ::clear
sets the number of blocks to 0/ It is followed directly by build(dofs);
will thow an exeption:
Additional information:
Dimension 0 not equal to 2.
There is no way to set number of block properly other than using
MGConstrainedDoFs
<https://dealii.org/current/doxygen/deal.II/classMGConstrainedDoFs.html> .
In case of DG where there are no constrains this requires creating dummy
objects.
Moreover the default contructor (without parameters) does not work (error
in compilation - deleted function). Using it could be useful for DG. I
would suggest:
1) adding constuctor with number of blocks
2) adding function that sets number of blocks
Best
Michal
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