In our opinion there should be the same numbers.
It seems that during some operations (we do not know  where, therefore,
we write this email), for the object sub_objects[0][1]
n_rows() is set to zero because n_cols is zero.

Do you have any ideas for us?

source/lac/sparsity_pattern.cc around line 296 maybe?

Try running the testsuite in the current state and after you change this and let us know what you find!

Best
 W.

--
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Wolfgang Bangerth               email:            [email protected]
                                www: http://www.math.tamu.edu/~bangerth/

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