void
TaggingInterface::prepareMatrixTag(Assembly & assembly, unsigned int ivar, unsigned int jvar)
{
_ke_blocks.resize(_matrix_tags.size());
mooseAssert(_matrix_tags.size() >= 1, "we need at least one active tag");
auto mat_vector = _matrix_tags.begin();
for (auto i = beginIndex(_matrix_tags); i < _matrix_tags.size(); i++, ++mat_vector)
_ke_blocks[i] = &assembly.jacobianBlock(ivar, jvar, *mat_vector);
_local_ke.resize(_ke_blocks[0]->m(), _ke_blocks[0]->n());
_local_ke.zero();
}
