SparsityPattern¶
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class
dolfin.cpp.la.
SparsityPattern
(*args)¶ Bases:
object
This class implements a sparsity pattern data structure. It is used by most linear algebra backends.
Overloaded versions
SparsityPattern(primary_dim)
Create empty sparsity pattern
SparsityPattern(mpi_comm, index_maps, primary_dim)
Create sparsity pattern for a generic tensor
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Type_sorted
= 0¶
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Type_unsorted
= 1¶
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apply
()¶ Finalize sparsity pattern
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init
()¶ Initialize sparsity pattern for a generic tensor
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insert_full_rows_local
()¶ Insert full rows (or columns, according to primary dimension) using local (process-wise) indices. This must be called before any other sparse insertion occurs to avoid quadratic complexity of dense rows insertion
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insert_global
()¶ Overloaded versions
insert_global(i, j)
Insert a global entry - will be fixed by apply()
insert_global(entries)
Insert non-zero entries using global indices
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insert_local
()¶ Insert non-zero entries using local (process-wise) indices
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local_range
()¶ Return local range for dimension dim
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mpi_comm
()¶
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num_local_nonzeros
()¶ Fill vector with number of nonzeros in local_range for dimension 0
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num_nonzeros
()¶ Return number of local nonzeros
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num_nonzeros_diagonal
()¶ Fill array with number of nonzeros for diagonal block in local_range for dimension 0. For matrices, fill array with number of nonzeros per local row for diagonal block
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num_nonzeros_off_diagonal
()¶ Fill array with number of nonzeros for off-diagonal block in local_range for dimension 0. For matrices, fill array with number of nonzeros per local row for off-diagonal block. If there is no off-diagonal pattern, the vector is resized to zero-length
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primary_dim
()¶ Return primary dimension (e.g., 0=row partition, 1=column partition)
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rank
()¶ Return rank
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str
()¶ Return informal string representation (pretty-print)
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thisown
¶ The membership flag