Hi everyone,
I am trying to set-up a non-square MatrixFree operator for which the
destination and source vectors do not have the same dimension (in order
to use it in a Schur complement). The way I am doing this is by passing
two dof_handlers to the MatrixFree object, and select row_block=0 and
column_block=1 when initializing my MatrixFreeOperators::Base (derived)
object. In the assembly method, I am using multiple FEEvaluation object
associated with different selected blocks to evaluate the source vector
and integrate into the destination vector.
However, I am getting an assertion when trying debug my program, which
makes me think I misunderstood the possibilities of the
MatrixFreeOperators::Base class. The exact assertion is "AssertDimension
<https://www.dealii.org/current/doxygen/deal.II/group__Exceptions.html#ga9442b63275c9ef3fab29bc222831c49c>(dst.size(),
src.size());" and can be found line 1508 of
deal.II/matrix_free/operators.h (and also l. 1563 and l. 1617). The
message of this assertion is perfectly clear and tells me that my
operator should be a square one, but I fail to understand why. Is there
a fundamental limitation to this class that restricts it to square
operators? I guess this would make sense if the only purpose of this
class is to use it in a multigrid framework (which I do not really need
for my coupling matrix in any case).
Best regards,
Guilhem
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