[dune-pdelab] How to get nonzero per row in the initialisation of BCRSMatrixBackend?

[Ranjeet kumar]

Hi,
I am new to dune-pdelab and currently exploring the tutorials.
It will be a great help if you could explain how the number of nonzero per
rows determined in the initialization BCRSMatrixBackend?  In tutorial 0, it
is initialized with the *(1<<dim+1)*, whereas in tutorial 5 with the
*pow(1+2*degree,dim)*?

Thank you,
Kind regards,
Ranjeet
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