Graphlet (.gml)

Background & Context

    • Graphlet GML graph data format.
    • Used for the storage and exchange of graphs.
    • GML is an acronym derived from Graph Modeling Language.
    • Native format of the Graphlet graph editor software.
    • Stores attributed, directed, and undirected graphs.
    • Can contain user-defined graph, edge, and vertex attributes.
    • ASCII format.
    • Developed in 1995.

Import & Export

  • Import["file.gml"] imports the graph stored in the specified file, given as a single Graph object.
  • Export["file.gml",expr] exports an adjacency matrix or edge information for one graph to the Graphlet GML format.
  • Import["file.gml",elem] imports the specified element from a Graphlet GML file.
  • Import["file.gml",{elem,suba,subb,…}] imports a subelement.
  • Import["file.gml",{{elem1,elem2,…}}] imports multiple elements.
  • The import format can be specified with Import["file","Graphlet"] or Import["file",{"Graphlet",elem,…}].
  • Export["file.gml",expr,elem] creates a Graphlet GML file by treating expr as specifying element elem.
  • Export["file.gml",{expr1,expr2,…},{{elem1,elem2,…}}] treats each expri as specifying the corresponding elemi.
  • Export["file.gml",expr,opt1->val1,…] exports expr with the specified option elements taken to have the specified values.
  • Export["file.gml",{elem1->expr1,elem2->expr2,…},"Rules"] uses rules to specify the elements to be exported.
  • See the following reference pages for full general information:
  • Import, Exportimport from or export to a file
    CloudImport, CloudExportimport from or export to a cloud object
    ImportString, ExportStringimport from or export to a string
    ImportByteArray, ExportByteArrayimport from or export to a byte array

Import Elements

  • General Import elements:
  • "Elements" list of elements and options available in this file
    "Summary"summary of the file
    "Rules"list of rules for all available elements
  • Data representation elements:
  • "AdjacencyMatrix"edge information, given as a matrix
    "EdgeAttributes"edge attributes, represented as a list of rules
    "EdgeRules"connectivity data for the graphs, given as a list of rules
    "Graph"graph stored in the file, given as a Graph object
    "GraphAttributes"graph attributes, represented as a list of rules
    "Graphics"graph stored in the file, rendered as a graph plot
    "VertexAttributes"vertex attributes, represented as a list of rules
    "VertexCount"number of vertices in the graph
    "VertexList"vertices, given as a list of strings
  • Import by default uses the "Graph" element when importing from Graphlet GML.

Options

Examples

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Basic Examples  (7)

Import a graph from Graphlet GML, rendered as a Graph object:

Import a vertex list and vertex attributes:

Show vertex labels and arrowheads in the graph plot:

Export a Graph object to GML:

Export a list of edge rules representing a directed graph to GML:

Export an asymmetric adjacency matrix of the same graph represented in the above example to GML:

Render an adjacency matrix representation of a Graphlet GML graph as MatrixPlot:

Scope  (5)

Construct a list of vertex labels and their attributes in the form of rules:

Convert the first graph stored in a Sparse6 file to a Graphlet GML file:

Generate a Graphlet GML file from a list of edge rules and edge and graph attributes:

Export an adjacency matrix together with vertex labels and attributes:

Export a Graph object with a raster image as a label: