GDF is a simple text-based file format for storing a graph first used by the GUESS graph visualization software.

It also allows the application of labels to vertices and edges.

The GraphTheory[ImportGraph] and GraphTheory[ExportGraph] commands can read from and write to this format.

The general-purpose commands Import and Export also support this format.

$G≔\mathrm{Import}\left(''example/mirzakhani.gdf''\,\mathrm{base}=\mathrm{datadir}\right)$

$G≔\mathrm{Graph\; 1:\; an\; undirected\; graph\; with\; 63\; vertices\; and\; 183\; edge(s)}$

$\mathrm{GraphTheory}:-\mathrm{DrawGraph}\left(G\,\mathrm{style}=\mathrm{spring}\right)$

$\mathrm{DG}≔\mathrm{GraphTheory}:-\mathrm{SpecialGraphs}:-\mathrm{DyckGraph}\left(\right)$

$\mathrm{DG}≔\mathrm{Graph\; 2:\; an\; undirected\; graph\; with\; 32\; vertices\; and\; 48\; edge(s)}$

$\mathrm{Export}\left(''dyck.gdf''\,\mathrm{DG}\,\mathrm{base}=\mathrm{homedir}\right)$

$437$