Epetra_CrsGraph Class Reference

Epetra_CrsGraph: A class for constructing and using sparse compressed row graphs. More...

#include <Epetra_CrsGraph.h>

Inheritance diagram for Epetra_CrsGraph:

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Collaboration diagram for Epetra_CrsGraph:
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List of all members.

Public Member Functions

Epetra_CrsGraphoperator= (const Epetra_CrsGraph &Source)
 Assignment operator.
Constructors/Destructor
 Epetra_CrsGraph (Epetra_DataAccess CV, const Epetra_BlockMap &RowMap, const int *NumIndicesPerRow, bool StaticProfile=false)
 Epetra_CrsGraph constuctor with variable number of indices per row.
 Epetra_CrsGraph (Epetra_DataAccess CV, const Epetra_BlockMap &RowMap, int NumIndicesPerRow, bool StaticProfile=false)
 Epetra_CrsGraph constuctor with fixed number of indices per row.
 Epetra_CrsGraph (Epetra_DataAccess CV, const Epetra_BlockMap &RowMap, const Epetra_BlockMap &ColMap, const int *NumIndicesPerRow, bool StaticProfile=false)
 Epetra_CrsGraph constuctor with variable number of indices per row.
 Epetra_CrsGraph (Epetra_DataAccess CV, const Epetra_BlockMap &RowMap, const Epetra_BlockMap &ColMap, int NumIndicesPerRow, bool StaticProfile=false)
 Epetra_CrsGraph constuctor with fixed number of indices per row.
 Epetra_CrsGraph (const Epetra_CrsGraph &Graph)
 Copy constructor.
virtual ~Epetra_CrsGraph ()
 Epetra_CrsGraph Destructor.
Insertion/Removal methods
int InsertGlobalIndices (int GlobalRow, int NumIndices, int *Indices)
 Enter a list of elements in a specified global row of the graph.
int RemoveGlobalIndices (int GlobalRow, int NumIndices, int *Indices)
 Remove a list of elements from a specified global row of the graph.
int RemoveGlobalIndices (int Row)
 Remove all indices from a specified global row of the graph.
int InsertMyIndices (int LocalRow, int NumIndices, int *Indices)
 Enter a list of elements in a specified local row of the graph.
int RemoveMyIndices (int LocalRow, int NumIndices, int *Indices)
 Remove a list of elements from a specified local row of the graph.
int RemoveMyIndices (int Row)
 Remove all indices from a specified local row of the graph.
Transformation methods
int FillComplete ()
 Tranform to local index space. Perform other operations to allow optimal matrix operations.
int FillComplete (const Epetra_BlockMap &DomainMap, const Epetra_BlockMap &RangeMap)
 Transform to local index space using specified Domain/Range maps. Perform other operations to allow optimal matrix operations.
int OptimizeStorage ()
 Make consecutive row index sections contiguous, minimize internal storage used for constructing graph.
Extraction methods
int ExtractGlobalRowCopy (int GlobalRow, int LenOfIndices, int &NumIndices, int *Indices) const
 Extract a list of elements in a specified global row of the graph. Put into storage allocated by calling routine.
int ExtractMyRowCopy (int LocalRow, int LenOfIndices, int &NumIndices, int *Indices) const
 Extract a list of elements in a specified local row of the graph. Put into storage allocated by calling routine.
int ExtractGlobalRowView (int GlobalRow, int &NumIndices, int *&Indices) const
 Get a view of the elements in a specified global row of the graph.
int ExtractMyRowView (int LocalRow, int &NumIndices, int *&Indices) const
 Get a view of the elements in a specified local row of the graph.
Graph Properties Query Methods
bool Filled () const
 If FillComplete() has been called, this query returns true, otherwise it returns false.
bool StorageOptimized () const
 If OptimizeStorage() has been called, this query returns true, otherwise it returns false.
bool IndicesAreGlobal () const
 If column indices are in global range, this query returns true, otherwise it returns false.
bool IndicesAreLocal () const
 If column indices are in local range, this query returns true, otherwise it returns false.
bool LowerTriangular () const
 If graph is lower triangular in local index space, this query returns true, otherwise it returns false.
bool UpperTriangular () const
 If graph is upper triangular in local index space, this query returns true, otherwise it returns false.
bool NoDiagonal () const
 If graph has no diagonal entries in global index space, this query returns true, otherwise it returns false.
bool MyGlobalRow (int GID) const
 Returns true of GID is owned by the calling processor, otherwise it returns false.
bool HaveColMap () const
 Returns true if we have a well-defined ColMap, and returns false otherwise.
Atribute access functions
int NumMyRows () const
 Returns the number of matrix rows on this processor.
int NumGlobalRows () const
 Returns the number of matrix rows in global matrix.
int NumMyCols () const
 Returns the number of entries in the set of column-indices that appear on this processor.
int NumGlobalCols () const
 Returns the number of matrix columns in global matrix.
int NumGlobalNonzeros () const
 Returns the number of indices in the global graph.
int NumGlobalDiagonals () const
 Returns the number of diagonal entries in the global graph, based on global row/column index comparisons.
int NumMyDiagonals () const
 Returns the number of diagonal entries in the local graph, based on global row/column index comparisons.
int NumMyBlockRows () const
 Returns the number of block matrix rows on this processor.
int NumGlobalBlockRows () const
 Returns the number of Block matrix rows in global matrix.
int NumMyBlockCols () const
 Returns the number of Block matrix columns on this processor.
int NumGlobalBlockCols () const
 Returns the number of Block matrix columns in global matrix.
int NumMyBlockDiagonals () const
 Returns the number of Block diagonal entries in the local graph, based on global row/column index comparisons.
int NumGlobalBlockDiagonals () const
 Returns the number of Block diagonal entries in the global graph, based on global row/column index comparisons.
int NumGlobalEntries () const
 Returns the number of entries in the global graph.
int NumMyEntries () const
 Returns the number of entries on this processor.
int MaxRowDim () const
 Returns the max row dimension of block entries on the processor.
int GlobalMaxRowDim () const
 Returns the max row dimension of block entries across all processors.
int MaxColDim () const
 Returns the max column dimension of block entries on the processor.
int GlobalMaxColDim () const
 Returns the max column dimension of block entries across all processors.
int NumMyNonzeros () const
 Returns the number of indices in the local graph.
int NumGlobalIndices (int Row) const
 Returns the current number of nonzero entries in specified global row on this processor.
int NumAllocatedGlobalIndices (int Row) const
 Returns the allocated number of nonzero entries in specified global row on this processor.
int MaxNumIndices () const
 Returns the maximum number of nonzero entries across all rows on this processor.
int GlobalMaxNumIndices () const
 Returns the maximun number of nonzero entries across all rows across all processors.
int MaxNumNonzeros () const
 Returns the maximum number of nonzero points across all rows on this processor.
int GlobalMaxNumNonzeros () const
 Returns the maximun number of nonzero points across all rows across all processors.
int NumMyIndices (int Row) const
 Returns the current number of nonzero entries in specified local row on this processor.
int NumAllocatedMyIndices (int Row) const
 Returns the allocated number of nonzero entries in specified local row on this processor.
int IndexBase () const
 Returns the index base for row and column indices for this graph.
const Epetra_BlockMapRowMap () const
 Returns the RowMap associated with this graph.
int ReplaceRowMap (const Epetra_BlockMap &newmap)
int ReplaceColMap (const Epetra_BlockMap &newmap)
const Epetra_BlockMapColMap () const
 Returns the Column Map associated with this graph.
const Epetra_BlockMapDomainMap () const
 Returns the DomainMap associated with this graph.
const Epetra_BlockMapRangeMap () const
 Returns the RangeMap associated with this graph.
const Epetra_ImportImporter () const
 Returns the Importer associated with this graph.
const Epetra_ExportExporter () const
 Returns the Exporter associated with this graph.
const Epetra_CommComm () const
 Returns a pointer to the Epetra_Comm communicator associated with this graph.
Local/Global ID methods
int LRID (int GRID) const
 Returns the local row index for given global row index, returns -1 if no local row for this global row.
int GRID (int LRID) const
 Returns the global row index for give local row index, returns IndexBase-1 if we don't have this local row.
int LCID (int GCID) const
 Returns the local column index for given global column index, returns -1 if no local column for this global column.
int GCID (int LCID) const
 Returns the global column index for give local column index, returns IndexBase-1 if we don't have this local column.
bool MyGRID (int GRID) const
 Returns true if the GRID passed in belongs to the calling processor in this map, otherwise returns false.
bool MyLRID (int LRID) const
 Returns true if the LRID passed in belongs to the calling processor in this map, otherwise returns false.
bool MyGCID (int GCID) const
 Returns true if the GCID passed in belongs to the calling processor in this map, otherwise returns false.
bool MyLCID (int LCID) const
 Returns true if the LRID passed in belongs to the calling processor in this map, otherwise returns false.
Inlined Operator Methods
int * operator[] (int Loc)
 Inlined bracket operator for fast access to data. (Const and Non-const versions).
int * operator[] (int Loc) const
I/O Methods
virtual void Print (ostream &os) const
 Print method.
void PrintGraphData (ostream &os) const
void PrintGraphData (ostream &os, int level) const
Deprecated methods: These methods still work, but will be removed in a future version
const Epetra_BlockMapImportMap () const
 Use ColMap() instead.
int TransformToLocal ()
 Use FillComplete() instead.
int TransformToLocal (const Epetra_BlockMap *DomainMap, const Epetra_BlockMap *RangeMap)
 Use FillComplete(const Epetra_BlockMap& DomainMap, const Epetra_BlockMap& RangeMap) instead.
Expert Users and Developers Only
int ReferenceCount () const
 Returns the reference count of CrsGraphData.
const Epetra_CrsGraphDataDataPtr () const
 Returns a pointer to the CrsGraphData instance this CrsGraph uses.

Protected Member Functions

int * All_Indices () const
int * IndexOffset () const
int * NumIndicesPerRow () const
int * NumAllocatedIndicesPerRow () const
int ** Indices () const
int * Indices (int LocalRow) const
bool IndicesAreContiguous () const
bool StaticProfile () const
bool GlobalConstantsComputed () const
bool FindGlobalIndexLoc (int LocalRow, int Index, int Start, int &Loc) const
bool FindGlobalIndexLoc (int NumIndices, const int *Indices, int Index, int Start, int &Loc) const
bool FindMyIndexLoc (int LocalRow, int Index, int Start, int &Loc) const
bool FindMyIndexLoc (int NumIndices, const int *Indices, int Index, int Start, int &Loc) const
int InsertIndices (int Row, int NumIndices, int *Indices)
int MakeIndicesLocal (const Epetra_BlockMap &DomainMap, const Epetra_BlockMap &RangeMap)
void SetIndicesAreLocal (bool Flag)
void SetIndicesAreGlobal (bool Flag)
void SetSorted (bool Flag)
int SortIndices ()
 Sort column indices, row-by-row, in ascending order.
bool Sorted () const
 If SortIndices() has been called, this query returns true, otherwise it returns false.
int RemoveRedundantIndices ()
 Removes any redundant column indices in the rows of the graph.
bool NoRedundancies () const
 If RemoveRedundantIndices() has been called, this query returns true, otherwise it returns false.

Friends

class Epetra_CrsMatrix
class Epetra_VbrMatrix
class Epetra_FECrsGraph
class Epetra_FECrsMatrix
class Epetra_FEVbrMatrix
class Epetra_OffsetIndex

Detailed Description

Epetra_CrsGraph: A class for constructing and using sparse compressed row graphs.

Epetra_CrsGraph enables the piecewise construction and use of sparse matrix graphs (the integer structure without values) where entries are intended for row access.

Epetra_CrsGraph is an attribute of all Epetra row-based matrix classes, defining their nonzero structure and also holding their Epetra_Map attributes.

Constructing Epetra_CrsGraph objects

Constructing Epetra_CrsGraph objects is a multi-step process. The basic steps are as follows:

  1. Create Epetra_CrsGraph instance, including some initial storage, via constructor. In addition to the copy constructor, Epetra_CrsGraph has four different constructors. All four of these constructors have an argument, StaticProfile, which by default is set to false. If it is set to true, then the profile (the number of indices per row as defined by NumIndicesPerRow) will be rigidly enforced. Although this takes away flexibility, it allows a single array to be allocated for all indices. This decreases memory fragmentation and improves performance across many operations. A more detailed discussion of the StaticProfile option is found below.
    1. User-provided row map, variable nonzero profile: This constructor is used to define the row distribution of the graph and specify a varying number of nonzero entries per row. It is best to use this constructor when the user will be inserting entries using global index values and wants every column index to be included in the graph. Note that in this case, the column map will be built for the user when FillComplete() is called. This constructor is also appropriate for when there is a large variation in the number of indices per row. If this is not the case, the next constructor may be more convenient to use.
    2. User-provided row map, fixed nonzero profile: This constructor is used to define the row distribution of the graph and specify a fixed number of nonzero entries per row. It is best to use this constructor when the user will be inserting entries using global index values and wants every column index to be included in the graph. Note that in this case, the column map will be built for the user when FillComplete() is called. This constructor is also appropriate for when there is little or no variation in the number of indices per row.
    3. User-provided row map, user-provided column map and variable nonzero profile: This constructor is used to define the row and column distribution of the graph, and specify a varying number of nonzero entries per row. It is best to use this constructor when the user will be inserting entries and already knows which columns of the matrix should be included on each processor. Note that in this case, the column map will not be built for the user when FillComplete() is called. Also, if the user attempts to insert a column index whose GID is not part of the column map on that process, the index will be discarded. This property can be used to "filter out" column entries that should be ignored. This constructor is also appropriate for when there is a large variation in the number of indices per row. If this is not the case, the next constructor may be more convenient to use.
    4. User-provided row map, user-provided column map and fixed nonzero profile: This constructor is used to define the row and column distribution of the graph, and specify a fixed number of nonzero entries per row. It is best to use this constructor when the user will be inserting entries and already knows which columns of the matrix should be included on each processor. Note that in this case, the column map will not be built for the user when FillComplete() is called. Also, if the user attempts to insert a column index whose GID is not part of the column map on that process, the index will be discarded. This constructor is also appropriate for when there is little or no variation in the number of indices per row.
  2. Enter row and column entry information via calls to the InsertGlobalIndices method.
  3. Complete construction via FillComplete call, which performs the following tasks:
    1. Transforms indices to local index space (after this, IndicesAreLocal()==true)
    2. Sorts column-indices within each row
    3. Compresses out any redundant indices within rows
    4. Computes global data such as num-nonzeros, maximum row-lengths, etc.
  4. (Optional) Optimize the graph storage via a call to OptimizeStorage.

Performance Enhancement Issues

The Epetra_CrsGraph class attempts to address four basic types of situations, depending on the user's primary concern:

  1. Simple, flexible construction over minimal memory use or control of column indices: In this case the user wants to provide only a row distribution of the graph and insert indices without worrying about memory allocation performance. This type of user is best served by the constructor that requires only a row map, and a fixed number of indices per row. In fact, setting NumIndicesPerRow=0 is probably the best option.
  2. Stronger control over memory allocation performance and use over flexibility and simplicity: In this case the user explicitly set StaticProfile to true and will provide values, either a single global int or an array of int's, for NumIndicesPerRow, such that the actual number of indices submitted to the graph will not exceed the estimates. Because we know that NumIndicesPerRow will not be exceeded, we can pre-allocate all of the storage for the graph as a single array. This is typically much more efficient.
  3. Explicit control over column indices: In this case the user prescribes the column map. Given the column map, any index that is submitted for entry into the graph will be included only if they are present in the list of GIDs for the column map on the processor that submits the index. This feature allows the user to define a filter such that only certain columns will be kept. The user also prescribes the local ordering via this technique, since the ordering of GIDs in the column map imposes the local ordering.
  4. Construction using local indices only: In some situations, users may want to build a graph using local index values only. In this case, the user must explicitly assign GIDs. This is done by prescribing the column map, in the same way as the previous situation.

Notes:

Epetra_Map attributes

Epetra_CrsGraph objects have four Epetra_Map attributes.

The Epetra_Map attributes can be obtained via these accessor methods:

It is important to note that while the row-map and the range-map are often the same, the column-map and the domain-map are almost never the same. The set of entries in a distributed column-map almost always form overlapping sets, with entries being associated with more than one processor. A domain-map, on the other hand, must be a 1-to-1 map, with entries being associated with only a single processor.

Global versus Local indices

After creation and before FillComplete() has been called, the column-indices of the graph are in the global space as received from the user. One of the tasks performed by FillComplete() is to transform the indices to a local index space. The query methods IndicesAreGlobal() and IndicesAreLocal() return true or false depending on whether this transformation has been performed or not.

Note the behavior of several graph methods:

Note that even after a graph is constructed, it is possible to add or remove entries. However, FillComplete must then be called again to restore the graph to a consistent state.


Constructor & Destructor Documentation

Epetra_CrsGraph::Epetra_CrsGraph Epetra_DataAccess  CV,
const Epetra_BlockMap RowMap,
const int *  NumIndicesPerRow,
bool  StaticProfile = false
 

Epetra_CrsGraph constuctor with variable number of indices per row.

Creates a Epetra_CrsGraph object and allocates storage.

Parameters:
CV - (In) A Epetra_DataAccess enumerated type set to Copy or View.
RowMap - (In) An Epetra_BlockMap (or Epetra_Map or Epetra_LocalMap) listing the rows that this processor will contribute to.In
NumIndicesPerRow - (In) An integer array of length NumMyRows such that NumIndicesPerRow[i] indicates the (approximate if StaticProfile=false) number of entries in the ith row.
StaticProfile - (In) Optional argument that indicates whether or not NumIndicesPerRow should be interpreted as an exact count of nonzeros, or should be used as an approximation. By default this value is false, allowing the profile to be determined dynamically. If the user sets it to true, then the memory allocation for the Epetra_CrsGraph object will be done in one large block, saving on memory fragmentation and generally improving the performance of matrix multiplication and solve kernels.

Epetra_CrsGraph::Epetra_CrsGraph Epetra_DataAccess  CV,
const Epetra_BlockMap RowMap,
int  NumIndicesPerRow,
bool  StaticProfile = false
 

Epetra_CrsGraph constuctor with fixed number of indices per row.

Creates a Epetra_CrsGraph object and allocates storage.

Parameters:
CV - (In) A Epetra_DataAccess enumerated type set to Copy or View.
RowMap - (In) An Epetra_BlockMap (or Epetra_Map or Epetra_LocalMap) listing the rows that this processor will contribute to.
NumIndicesPerRow - (In) An integer that indicates the (approximate if StaticProfile=false) number of entries in the each row. Note that it is possible to use 0 for this value and let fill occur during the insertion phase.
StaticProfile - (In) Optional argument that indicates whether or not NumIndicesPerRow should be interpreted as an exact count of nonzeros, or should be used as an approximation. By default this value is false, allowing the profile to be determined dynamically. If the user sets it to true, then the memory allocation for the Epetra_CrsGraph object will be done in one large block, saving on memory fragmentation and generally improving the performance of matrix multiplication and solve kernels.

Epetra_CrsGraph::Epetra_CrsGraph Epetra_DataAccess  CV,
const Epetra_BlockMap RowMap,
const Epetra_BlockMap ColMap,
const int *  NumIndicesPerRow,
bool  StaticProfile = false
 

Epetra_CrsGraph constuctor with variable number of indices per row.

Creates a Epetra_CrsGraph object and allocates storage.

Parameters:
CV - (In) A Epetra_DataAccess enumerated type set to Copy or View.
RowMap - (In) An Epetra_BlockMap (or Epetra_Map or Epetra_LocalMap) listing the rows that this processor will contribute to.
ColMap - (In) An Epetra_BlockMap (or Epetra_Map or Epetra_LocalMap) listing the columns that this processor will contribute to.
NumIndicesPerRow - (In) An integer array of length NumMyRows such that NumIndicesPerRow[i] indicates the (approximate if StaticProfile=false) number of entries in the ith row.
StaticProfile - (In) Optional argument that indicates whether or not NumIndicesPerRow should be interpreted as an exact count of nonzeros, or should be used as an approximation. By default this value is false, allowing the profile to be determined dynamically. If the user sets it to true, then the memory allocation for the Epetra_CrsGraph object will be done in one large block, saving on memory fragmentation and generally improving the performance of matrix multiplication and solve kernels.

Epetra_CrsGraph::Epetra_CrsGraph Epetra_DataAccess  CV,
const Epetra_BlockMap RowMap,
const Epetra_BlockMap ColMap,
int  NumIndicesPerRow,
bool  StaticProfile = false
 

Epetra_CrsGraph constuctor with fixed number of indices per row.

Creates a Epetra_CrsGraph object and allocates storage.

Parameters:
CV - (In) A Epetra_DataAccess enumerated type set to Copy or View.
RowMap - (In) An Epetra_BlockMap (or Epetra_Map or Epetra_LocalMap) listing the rows that this processor will contribute to.
ColMap - (In) An Epetra_BlockMap (or Epetra_Map or Epetra_LocalMap) listing the columns that this processor will contribute to.
In NumIndicesPerRow - An integer that indicates the (approximate if StaticProfile=false) number of entries in the each row. Note that it is possible to use 0 for this value and let fill occur during the insertion phase.
StaticProfile - (In) Optional argument that indicates whether or not NumIndicesPerRow should be interpreted as an exact count of nonzeros, or should be used as an approximation. By default this value is false, allowing the profile to be determined dynamically. If the user sets it to true, then the memory allocation for the Epetra_CrsGraph object will be done in one large block, saving on memory fragmentation and generally improving the performance of matrix multiplication and solve kernels.

Epetra_CrsGraph::Epetra_CrsGraph const Epetra_CrsGraph Graph  ) 
 

Copy constructor.

This will create a Level 1 deep copy. This Graph will share ownership of the CrsGraphData object with the right hand side Graph.


Member Function Documentation

const Epetra_BlockMap& Epetra_CrsGraph::ColMap  )  const [inline]
 

Returns the Column Map associated with this graph.

Precondition:
HaveColMap()==true

const Epetra_CrsGraphData* Epetra_CrsGraph::DataPtr  )  const [inline]
 

Returns a pointer to the CrsGraphData instance this CrsGraph uses.

(Intended for developer use only for testing purposes.)

const Epetra_BlockMap& Epetra_CrsGraph::DomainMap  )  const [inline]
 

Returns the DomainMap associated with this graph.

Precondition:
Filled()==true

int Epetra_CrsGraph::ExtractGlobalRowCopy int  GlobalRow,
int  LenOfIndices,
int &  NumIndices,
int *  Indices
const
 

Extract a list of elements in a specified global row of the graph. Put into storage allocated by calling routine.

Parameters:
Row - (In) Global row number to get indices.
LenOfIndices - (In) Length of Indices array.
NumIndices - (Out) Number of Indices.
Indices - (Out) Global column indices corresponding to values.
Returns:
Integer error code, set to 0 if successful.

int Epetra_CrsGraph::ExtractGlobalRowView int  GlobalRow,
int &  NumIndices,
int *&  Indices
const
 

Get a view of the elements in a specified global row of the graph.

This function requires that the graph not be completed (FillComplete() was not called).

Parameters:
Row - (In) Local row number to get indices.
NumIndices - (Out) Number of Indices.
Indices - (Out) Column indices corresponding to values.
Returns:
Integer error code, set to 0 if successful. Returns -1 if invalid row. Returns -2 if graph is completed.
Precondition:
IndicesAreLocal()==false

int Epetra_CrsGraph::ExtractMyRowCopy int  LocalRow,
int  LenOfIndices,
int &  NumIndices,
int *  Indices
const
 

Extract a list of elements in a specified local row of the graph. Put into storage allocated by calling routine.

Parameters:
Row - (In) Local row number to get indices.
LenOfIndices - (In) Length of Indices array.
NumIndices - (Out) Number of Indices.
Indices - (Out) Local column indices corresponding to values.
Returns:
Integer error code, set to 0 if successful.
Precondition:
IndicesAreLocal()==true

int Epetra_CrsGraph::ExtractMyRowView int  LocalRow,
int &  NumIndices,
int *&  Indices
const
 

Get a view of the elements in a specified local row of the graph.

This function requires that the graph be completed FillComplete() was called).

Parameters:
Row - (In) Local row number to get indices.
NumIndices - (Out) Number of Indices.
Indices - (Out) Column indices corresponding to values.
Returns:
Integer error code, set to 0 if successful. Returns -1 if invalid row. Returns -2 if graph is not completed.
Precondition:
IndicesAreLocal()==true

int Epetra_CrsGraph::FillComplete const Epetra_BlockMap DomainMap,
const Epetra_BlockMap RangeMap
 

Transform to local index space using specified Domain/Range maps. Perform other operations to allow optimal matrix operations.

Performs this sequence of operations:

  1. Transform indices to local index space
  2. Sort column-indices within each row
  3. Compress out any redundant indices within rows
  4. Compute global data such as num-nonzeros, maximum row-lengths, etc.
Returns:
Integer error code, set to 0 if successful. Returns 1 if data is shared (i.e., if the underlying graph-data object has a reference-count greater than 1).
Postcondition:
IndicesAreLocal()==true, Filled()==true

int Epetra_CrsGraph::FillComplete  ) 
 

Tranform to local index space. Perform other operations to allow optimal matrix operations.

This overloading of the FillComplete method assumes that the domain-map and range-map both equal the row-map, and simply calls FillComplete(RowMap(), RowMap()).

Returns:
Integer error code, set to 0 if successful. Returns 1 if data is shared (i.e., if the underlying graph-data object has a reference-count greater than 1).
Postcondition:
IndicesAreLocal()==true, Filled()==true

int Epetra_CrsGraph::GCID int  LCID  )  const [inline]
 

Returns the global column index for give local column index, returns IndexBase-1 if we don't have this local column.

Precondition:
HaveColMap()==true (If HaveColMap()==false, returns -1)

int Epetra_CrsGraph::GlobalMaxColDim  )  const [inline]
 

Returns the max column dimension of block entries across all processors.

Precondition:
Filled()==true

int Epetra_CrsGraph::GlobalMaxNumIndices  )  const [inline]
 

Returns the maximun number of nonzero entries across all rows across all processors.

Precondition:
Filled()==true

int Epetra_CrsGraph::GlobalMaxNumNonzeros  )  const [inline]
 

Returns the maximun number of nonzero points across all rows across all processors.

This function returns the max over all processor of MaxNumNonzeros().

Precondition:
Filled()==true

int Epetra_CrsGraph::GlobalMaxRowDim  )  const [inline]
 

Returns the max row dimension of block entries across all processors.

Precondition:
Filled()==true

bool Epetra_CrsGraph::HaveColMap  )  const [inline]
 

Returns true if we have a well-defined ColMap, and returns false otherwise.

Precondition:
We have a well-defined ColMap if a) a ColMap was passed in at construction, or b) the MakeColMap function has been called. (Calling either of the FillComplete functions will result in MakeColMap being called.)

int Epetra_CrsGraph::InsertGlobalIndices int  GlobalRow,
int  NumIndices,
int *  Indices
 

Enter a list of elements in a specified global row of the graph.

Parameters:
Row - (In) Global row number of indices.
NumIndices - (In) Number of Indices.
Indices - (In) Global column indices to insert.
Returns:
Integer error code, set to 0 if successful. If the insertion requires that additional memory be allocated for the row, a positive error code of 1 is returned. If the graph is a 'View' mode graph, then a positive warning code of 2 will be returned if the specified row already exists. Returns 1 if underlying graph data is shared by multiple graph instances.
Precondition:
IndicesAreGlobal()==true, StorageOptimized()==false

int Epetra_CrsGraph::InsertMyIndices int  LocalRow,
int  NumIndices,
int *  Indices
 

Enter a list of elements in a specified local row of the graph.

Parameters:
Row - (In) Local row number of indices.
NumIndices - (In) Number of Indices.
Indices - (In) Local column indices to insert.
Returns:
Integer error code, set to 0 if successful. If the insertion requires that additional memory be allocated for the row, a positive error code of 1 is returned. If one or more of the indices is ignored (due to not being contained in the column-map), then a positive warning code of 2 is returned. If the graph is a 'View' mode graph, then a positive warning code of 3 will be returned if the specified row already exists. Returns 1 if underlying graph data is shared by multiple graph instances.
Precondition:
IndicesAreLocal()==true, StorageOptimized()==false

int Epetra_CrsGraph::LCID int  GCID  )  const [inline]
 

Returns the local column index for given global column index, returns -1 if no local column for this global column.

Precondition:
HaveColMap()==true (If HaveColMap()==false, returns -1)

bool Epetra_CrsGraph::LowerTriangular  )  const [inline]
 

If graph is lower triangular in local index space, this query returns true, otherwise it returns false.

Precondition:
Filled()==true

int Epetra_CrsGraph::MaxColDim  )  const [inline]
 

Returns the max column dimension of block entries on the processor.

Precondition:
Filled()==true

int Epetra_CrsGraph::MaxNumIndices  )  const [inline]
 

Returns the maximum number of nonzero entries across all rows on this processor.

Precondition:
Filled()==true

int Epetra_CrsGraph::MaxNumNonzeros  )  const [inline]
 

Returns the maximum number of nonzero points across all rows on this processor.

For each entry in the graph, let i = the GRID of the entry and j = the CGID of the entry. Then the entry size is the product of the rowmap elementsize of i and the colmap elementsize of i. Let ki = sum of all entry sizes for the entries in the ith row. For example, if the ith block row had 5 block entries and the element size of each entry was 4-by-4, ki would be 80. Then this function returns the max over all ki for all row on this processor.

Precondition:
Filled()==true

int Epetra_CrsGraph::MaxRowDim  )  const [inline]
 

Returns the max row dimension of block entries on the processor.

Precondition:
Filled()==true

bool Epetra_CrsGraph::MyGCID int  GCID  )  const [inline]
 

Returns true if the GCID passed in belongs to the calling processor in this map, otherwise returns false.

Precondition:
HaveColMap()==true (If HaveColMap()==false, returns -1)

bool Epetra_CrsGraph::MyLCID int  LCID  )  const [inline]
 

Returns true if the LRID passed in belongs to the calling processor in this map, otherwise returns false.

Precondition:
HaveColMap()==true (If HaveColMap()==false, returns -1)

bool Epetra_CrsGraph::NoDiagonal  )  const [inline]
 

If graph has no diagonal entries in global index space, this query returns true, otherwise it returns false.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumGlobalBlockCols  )  const [inline]
 

Returns the number of Block matrix columns in global matrix.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumGlobalBlockDiagonals  )  const [inline]
 

Returns the number of Block diagonal entries in the global graph, based on global row/column index comparisons.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumGlobalCols  )  const [inline]
 

Returns the number of matrix columns in global matrix.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumGlobalDiagonals  )  const [inline]
 

Returns the number of diagonal entries in the global graph, based on global row/column index comparisons.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumGlobalEntries  )  const [inline]
 

Returns the number of entries in the global graph.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumGlobalNonzeros  )  const [inline]
 

Returns the number of indices in the global graph.

Note that if the graph's maps are defined such that some nonzeros appear on more than one processor, then those nonzeros will be counted more than once. If the user wishes to assemble a graph from overlapping data, they can use Epetra_FECrsGraph.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumMyBlockCols  )  const [inline]
 

Returns the number of Block matrix columns on this processor.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumMyBlockDiagonals  )  const [inline]
 

Returns the number of Block diagonal entries in the local graph, based on global row/column index comparisons.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumMyCols  )  const [inline]
 

Returns the number of entries in the set of column-indices that appear on this processor.

The set of column-indices that appear on this processor is the union of column-indices that appear in all local rows. The size of this set isn't available until FillComplete() has been called.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumMyDiagonals  )  const [inline]
 

Returns the number of diagonal entries in the local graph, based on global row/column index comparisons.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumMyEntries  )  const [inline]
 

Returns the number of entries on this processor.

Precondition:
Filled()==true

int Epetra_CrsGraph::NumMyNonzeros  )  const [inline]
 

Returns the number of indices in the local graph.

Precondition:
Filled()==true

Epetra_CrsGraph& Epetra_CrsGraph::operator= const Epetra_CrsGraph Source  ) 
 

Assignment operator.

This will do a Level 1 deep copy. It will share ownership of the CrsGraphData with the right hand side Graph.

int* Epetra_CrsGraph::operator[] int  Loc  )  [inline]
 

Inlined bracket operator for fast access to data. (Const and Non-const versions).

No error checking and dangerous for optimization purposes.

Parameters:
Loc (In) - Local row.
Returns:
reference to pointer to locally indexed Loc row in matrix.

int Epetra_CrsGraph::OptimizeStorage  ) 
 

Make consecutive row index sections contiguous, minimize internal storage used for constructing graph.

After construction and during initialization (when indices are being added via InsertGlobalIndices() etc.), the column- indices for each row are held in a separate piece of allocated memory. This method moves the column-indices for all rows into one large contiguous array and eliminates internal storage that is not needed after graph construction. Calling this method can have a significant impact on memory costs and machine performance.

If this object was constructed in View mode then this method can't make non-contiguous indices contiguous and will return a warning code of 1 if the viewed data isn't already contiguous.

Returns:
Integer error code, set to 0 if successful.
Precondition:
Filled()==true.

If CV=View when the graph was constructed, then this method will be effective if the indices of the graph were already contiguous. In this case, the indices are left untouched and internal storage for the graph is minimized.

Postcondition:
StorageOptimized()==true, if successful

const Epetra_BlockMap& Epetra_CrsGraph::RangeMap  )  const [inline]
 

Returns the RangeMap associated with this graph.

Precondition:
Filled()==true

int Epetra_CrsGraph::ReferenceCount  )  const [inline]
 

Returns the reference count of CrsGraphData.

(Intended for testing purposes.)

int Epetra_CrsGraph::RemoveGlobalIndices int  Row  ) 
 

Remove all indices from a specified global row of the graph.

Parameters:
Row - (In) Global row number of indices.
Returns:
Integer error code, set to 0 if successful. Returns 1 if data is shared.
Precondition:
IndicesAreGlobal()==true, StorageOptimized()==false

int Epetra_CrsGraph::RemoveGlobalIndices int  GlobalRow,
int  NumIndices,
int *  Indices
 

Remove a list of elements from a specified global row of the graph.

Parameters:
Row - (In) Global row number of indices.
NumIndices - (In) Number of Indices.
Indices - (In) Global column indices to remove.
Returns:
Integer error code, set to 0 if successful. Returns 1 if data is shared.
Precondition:
IndicesAreGlobal()==true, StorageOptimized()==false

int Epetra_CrsGraph::RemoveMyIndices int  Row  ) 
 

Remove all indices from a specified local row of the graph.

Parameters:
Row - (In) Local row number of indices.
Returns:
Integer error code, set to 0 if successful. Returns 1 if data is shared.
Precondition:
IndicesAreLocal()==true, StorageOptimized()==false

int Epetra_CrsGraph::RemoveMyIndices int  LocalRow,
int  NumIndices,
int *  Indices
 

Remove a list of elements from a specified local row of the graph.

Parameters:
Row - (In) Local row number of indices.
NumIndices - (In) Number of Indices.
Indices - (In) Local column indices to remove.
Returns:
Integer error code, set to 0 if successful. Returns 1 if data is shared.
Precondition:
IndicesAreLocal()==true, StorageOptimized()==false

int Epetra_CrsGraph::RemoveRedundantIndices  )  [protected]
 

Removes any redundant column indices in the rows of the graph.

Returns:
Integer error code, set to 0 if successful. Returns 1 if data is shared.

int Epetra_CrsGraph::ReplaceColMap const Epetra_BlockMap newmap  ) 
 

Replaces the current ColMap with the user-specified map object, but only if currentmap->PointSameAs(newmap) is true. This is a collective function. Returns 0 if map is replaced, -1 if not.

Precondition:
ColMap().PointSameAs(newmap)==true

int Epetra_CrsGraph::ReplaceRowMap const Epetra_BlockMap newmap  ) 
 

Replaces the current RowMap with the user-specified map object, but only if currentmap->PointSameAs(newmap) is true. This is a collective function. Returns 0 if map is replaced, -1 if not.

Precondition:
RowMap().PointSameAs(newmap)==true

int Epetra_CrsGraph::SortIndices  )  [protected]
 

Sort column indices, row-by-row, in ascending order.

Returns:
Integer error code, set to 0 if successful. Returns 1 if data is shared.

bool Epetra_CrsGraph::UpperTriangular  )  const [inline]
 

If graph is upper triangular in local index space, this query returns true, otherwise it returns false.

Precondition:
Filled()==true


The documentation for this class was generated from the following file:
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