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t | d� � z z }||k rdS d S |dz dk r |dz dk r|dt | d� � z z } nd } | |k rdS ||k rd S ||k rdS dS )z�Attempt to determine the blocksize of a sparse matrix
Returns a blocksize=(r,c) such that
- A.nnz / A.tobsr( (r,c) ).nnz > efficiency
� )r r g �?z.efficiency must satisfy 0.0 < efficiency < 1.0g @� � )r r g � � )r r �$ )� r � )r
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blocks in a sparse matrix A
r zr and c must be positive)
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