Detailed Description

Functions
SCIP_RETCODE	SCIPdigraphCreate (SCIP_DIGRAPH **digraph, int nnodes)

SCIP_RETCODE	SCIPdigraphResize (SCIP_DIGRAPH *digraph, int nnodes)

SCIP_RETCODE	SCIPdigraphCopy (SCIP_DIGRAPH *targetdigraph, SCIP_DIGRAPH sourcedigraph)

SCIP_RETCODE	SCIPdigraphSetSizes (SCIP_DIGRAPH digraph, int sizes)

void	SCIPdigraphFree (SCIP_DIGRAPH **digraph)

SCIP_RETCODE	SCIPdigraphAddArc (SCIP_DIGRAPH digraph, int startnode, int endnode, void data)

SCIP_RETCODE	SCIPdigraphAddArcSafe (SCIP_DIGRAPH digraph, int startnode, int endnode, void data)

SCIP_RETCODE	SCIPdigraphSetNSuccessors (SCIP_DIGRAPH *digraph, int node, int nsuccessors)

int	SCIPdigraphGetNNodes (SCIP_DIGRAPH *digraph)

void *	SCIPdigraphGetNodeData (SCIP_DIGRAPH *digraph, int node)

void	SCIPdigraphSetNodeData (SCIP_DIGRAPH digraph, void dataptr, int node)

int	SCIPdigraphGetNArcs (SCIP_DIGRAPH *digraph)

int	SCIPdigraphGetNSuccessors (SCIP_DIGRAPH *digraph, int node)

int *	SCIPdigraphGetSuccessors (SCIP_DIGRAPH *digraph, int node)

void **	SCIPdigraphGetSuccessorsData (SCIP_DIGRAPH *digraph, int node)

SCIP_RETCODE	SCIPdigraphComputeUndirectedComponents (SCIP_DIGRAPH digraph, int minsize, int components, int *ncomponents)

SCIP_RETCODE	SCIPdigraphComputeDirectedComponents (SCIP_DIGRAPH digraph, int compidx, int strongcomponents, int strongcompstartidx, int nstrongcomponents)

SCIP_RETCODE	SCIPdigraphTopoSortComponents (SCIP_DIGRAPH *digraph)

int	SCIPdigraphGetNComponents (SCIP_DIGRAPH *digraph)

void	SCIPdigraphGetComponent (SCIP_DIGRAPH digraph, int compidx, int nodes, int nnodes)

void	SCIPdigraphFreeComponents (SCIP_DIGRAPH *digraph)

void	SCIPdigraphPrint (SCIP_DIGRAPH digraph, SCIP_MESSAGEHDLR messagehdlr, FILE *file)

void	SCIPdigraphPrintGml (SCIP_DIGRAPH digraph, FILE file)

void	SCIPdigraphPrintComponents (SCIP_DIGRAPH digraph, SCIP_MESSAGEHDLR messagehdlr, FILE *file)

Function Documentation

SCIP_RETCODE SCIPdigraphCreate	(	SCIP_DIGRAPH **	digraph,
		int	nnodes
	)

creates directed graph structure

Parameters

digraph	pointer to store the created directed graph
nnodes	number of nodes

SCIP_RETCODE SCIPdigraphResize	(	SCIP_DIGRAPH *	digraph,
		int	nnodes
	)

resize directed graph structure

Parameters

digraph	directed graph
nnodes	new number of nodes

SCIP_RETCODE SCIPdigraphCopy	(	SCIP_DIGRAPH **	targetdigraph,
		SCIP_DIGRAPH *	sourcedigraph
	)

copies directed graph structure

Note: The data in nodedata is copied verbatim. This possibly has to be adapted by the user.

Parameters

targetdigraph	pointer to store the copied directed graph
sourcedigraph	source directed graph

SCIP_RETCODE SCIPdigraphSetSizes	(	SCIP_DIGRAPH *	digraph,
		int *	sizes
	)

sets the sizes of the successor lists for the nodes in a directed graph and allocates memory for the lists

Parameters

digraph	directed graph
sizes	sizes of the successor lists

void SCIPdigraphFree ( SCIP_DIGRAPH ** digraph )

frees given directed graph structure

Parameters

digraph pointer to the directed graph

SCIP_RETCODE SCIPdigraphAddArc	(	SCIP_DIGRAPH *	digraph,
		int	startnode,
		int	endnode,
		void *	data
	)

add (directed) arc and a related data to the directed graph structure

Note: if the arc is already contained, it is added a second time

Parameters

digraph	directed graph
startnode	start node of the arc
endnode	start node of the arc
data	data that should be stored for the arc; or NULL

SCIP_RETCODE SCIPdigraphAddArcSafe	(	SCIP_DIGRAPH *	digraph,
		int	startnode,
		int	endnode,
		void *	data
	)

add (directed) arc to the directed graph structure, if it is not contained, yet

Note: if there already exists an arc from startnode to endnode, the new arc is not added, even if its data is different

Parameters

digraph	directed graph
startnode	start node of the arc
endnode	start node of the arc
data	data that should be stored for the arc; or NULL

SCIP_RETCODE SCIPdigraphSetNSuccessors	(	SCIP_DIGRAPH *	digraph,
		int	node,
		int	nsuccessors
	)

sets the number of successors to a given value

Parameters

digraph	directed graph
node	node for which the number of successors has to be changed
nsuccessors	new number of successors

int SCIPdigraphGetNNodes ( SCIP_DIGRAPH * digraph )

returns the number of nodes of the given digraph

Parameters

digraph directed graph

void* SCIPdigraphGetNodeData	(	SCIP_DIGRAPH *	digraph,
		int	node
	)

returns the node data, or NULL if no data exist

Parameters

digraph	directed graph
node	node for which the node data is returned

void SCIPdigraphSetNodeData	(	SCIP_DIGRAPH *	digraph,
		void *	dataptr,
		int	node
	)

sets the node data

Parameters

digraph	directed graph
dataptr	user node data pointer, or NULL
node	node for which the node data is returned

int SCIPdigraphGetNArcs ( SCIP_DIGRAPH * digraph )

returns the total number of arcs in the given digraph

Parameters

digraph directed graph

int SCIPdigraphGetNSuccessors	(	SCIP_DIGRAPH *	digraph,
		int	node
	)

returns the number of successor nodes of the given node

Parameters

digraph	directed graph
node	node for which the number of outgoing arcs is returned

int* SCIPdigraphGetSuccessors	(	SCIP_DIGRAPH *	digraph,
		int	node
	)

returns the array of indices of the successor nodes; this array must not be changed from outside

Parameters

digraph	directed graph
node	node for which the array of outgoing arcs is returned

void** SCIPdigraphGetSuccessorsData	(	SCIP_DIGRAPH *	digraph,
		int	node
	)

returns the array of data corresponding to the arcs originating at the given node, or NULL if no data exist; this array must not be changed from outside

Parameters

digraph	directed graph
node	node for which the data corresponding to the outgoing arcs is returned

SCIP_RETCODE SCIPdigraphComputeUndirectedComponents	(	SCIP_DIGRAPH *	digraph,
		int	minsize,
		int *	components,
		int *	ncomponents
	)

Compute undirected connected components on the given graph.

Note: For each arc, its reverse is added, so the graph does not need to be the directed representation of an undirected graph.

Parameters

digraph	directed graph
minsize	all components with less nodes are ignored
components	array with as many slots as there are nodes in the directed graph to store for each node the component to which it belongs (components are numbered 0 to ncomponents - 1); or NULL, if components are accessed one-by-one using SCIPdigraphGetComponent()
ncomponents	pointer to store the number of components; or NULL, if the number of components is accessed by SCIPdigraphGetNComponents()

SCIP_RETCODE SCIPdigraphComputeDirectedComponents	(	SCIP_DIGRAPH *	digraph,
		int	compidx,
		int *	strongcomponents,
		int *	strongcompstartidx,
		int *	nstrongcomponents
	)

Computes all strongly connected components of an undirected connected component with Tarjan's Algorithm. The resulting strongly connected components are sorted topologically (starting from the end of the strongcomponents array).

Note: In general a topological sort of the strongly connected components is not unique.

Parameters

digraph	directed graph
compidx	number of the undirected connected component
strongcomponents	array to store the strongly connected components (length >= size of the component)
strongcompstartidx	array to store the start indices of the strongly connected components (length >= size of the component)
nstrongcomponents	pointer to store the number of strongly connected components

SCIP_RETCODE SCIPdigraphTopoSortComponents ( SCIP_DIGRAPH * digraph )

Performes an (almost) topological sort on the undirected components of the given directed graph. The undirected components should be computed before using SCIPdigraphComputeUndirectedComponents().

Note: In general a topological sort is not unique. Note, that there might be directed cycles, that are randomly broken, which is the reason for having only almost topologically sorted arrays.

Parameters

digraph directed graph

int SCIPdigraphGetNComponents ( SCIP_DIGRAPH * digraph )

returns the number of previously computed undirected components for the given directed graph

Parameters

digraph directed graph

void SCIPdigraphGetComponent	(	SCIP_DIGRAPH *	digraph,
		int	compidx,
		int **	nodes,
		int *	nnodes
	)

Returns the previously computed undirected component of the given number for the given directed graph. If the components were sorted using SCIPdigraphTopoSortComponents(), the component is (almost) topologically sorted.

Parameters

digraph	directed graph
compidx	number of the component to return
nodes	pointer to store the nodes in the component; or NULL, if not needed
nnodes	pointer to store the number of nodes in the component; or NULL, if not needed

void SCIPdigraphFreeComponents ( SCIP_DIGRAPH * digraph )

frees the component information for the given directed graph

Parameters

digraph directed graph

void SCIPdigraphPrint	(	SCIP_DIGRAPH *	digraph,
		SCIP_MESSAGEHDLR *	messagehdlr,
		FILE *	file
	)

output of the given directed graph via the given message handler

Parameters

digraph	directed graph
messagehdlr	message handler
file	output file (or NULL for standard output)

void SCIPdigraphPrintGml	(	SCIP_DIGRAPH *	digraph,
		FILE *	file
	)

prints the given directed graph structure in GML format into the given file

Parameters

digraph	directed graph
file	file to write to

void SCIPdigraphPrintComponents	(	SCIP_DIGRAPH *	digraph,
		SCIP_MESSAGEHDLR *	messagehdlr,
		FILE *	file
	)

output of the given directed graph via the given message handler

Parameters

digraph	directed graph
messagehdlr	message handler
file	output file (or NULL for standard output)

SCIP

Detailed Description

Functions

Function Documentation