MATHEMATICA IMPORT/EXPORT FORMAT

DIMACS (.col, .col.b)

DIMACS graph data format.
Commonly used exchange format for graphs.
Stores a single undirected graph.
Plain text or binary format.
DIMACS is an acronym derived from Discrete Mathematics and Theoretical Computer Science.
Developed in 1993 at Rutgers University.

Import and Export fully support the DIMACS format.

Import and Export Import and Export

Import["file.col"] gives a Graph object representing the graph stored in the specified file.
Export["file.col", expr] exports an adjacency matrix or edge information representing a graph to the DIMACS format.
Import["file.col"] imports the graph from file and returns it as a Graph.
Import["file.col", elem] imports the specified element from a DIMACS file.
Import["file.col", {{elem₁, elem₂, ...}}] imports multiple elements.
The import format can be specified with Import["file", "DIMACS"] or Import["file", {"DIMACS", elem, ...}].
Export["file.col", expr, elem] creates a DIMACS file by treating expr as specifying element elem.
Export["file.col", {expr₁, expr₂, ...}, {{elem₁, elem₂, ...}}] treats each as specifying the corresponding .
Export["file.col", expr, opt₁->val₁, ...] exports expr with the specified option elements taken to have the specified values.
Export["file.col", {elem₁->expr₁, elem₂->expr₂, ...}, "Rules"] uses rules to specify the elements to be exported.
See the reference pages for full general information on Import and Export.
ImportString and ExportString support the DIMACS file format.

Elements Elements

General Import elements:

	"Elements"	list of elements and options available in this file
	"Rules"	full list of rules for each element and option
	"Options"	list of rules for options, properties, and settings

Data representation elements:

	"AdjacencyMatrix"	edge information, given as a matrix
	"EdgeRules"	connectivity data for the graph, given as a list of rules
	"Graph"	graph stored in the file, given as a Graph object
	"Graphics"	graph stored in the file, rendered as a graph plot
	"VertexCount"	number of vertices in the graph

Import by default uses the element when importing from DIMACS.

Options Options

General Import options:
ImageSize Automatic specifies the overall size of the image to display for a graph
Export option:
BinaryFormat False whether to create a binary DIMACS file
When importing from DIMACS, all options supported by Graph can be given. Common settings include:

EdgeLabels	Automatic	labels and label placement for edge
EdgeWeight	Automatic	weight for edge
VertexCoordinates	Automatic	center coordinate for vertex
VertexLabels	Automatic	labels and label placement for vertex
VertexShape	Automatic	graphic shape for vertex

When importing as , all options supported by GraphPlot can be given. Common settings include:

DirectedEdges	Automatic	whether to show edges as directed arrows
EdgeLabeling	Automatic	whether to include labels given for edges
EdgeRenderingFunction	Automatic	function to give explicit graphics for edges
VertexLabeling	Automatic	whether to show vertex names as labels
VertexRenderingFunction	Automatic	function to give explicit graphics for vertices