Subgraph

Subgraph[g,{v1,v2,…}]

gives the subgraph of the graph g generated by the vertices vi.

Subgraph[g,{e1,e2,…}]

gives the subgraph generated by the edges ej.

Subgraph[g,patt]

gives the subgraph generated by the vertices and edges that match the pattern patt.

Subgraph[{vw,…},…]

uses rules vw to specify the graph g.

Details and Options

  • The subgraph generated by the vertices v1,v2,… includes the vertices vi and all edges connecting them in the original graph g.
  • The subgraph generated by the edges e1,e2,… includes the edges ej and all edges connecting vertices vi of ej in the original graph g.
  • Subgraph works with undirected graphs, directed graphs, multigraphs, and mixed graphs.

Examples

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Basic Examples  (1)

Give a subgraph of a complete graph:

Highlight the subgraph within the main graph:

Scope  (7)

Subgraph works with undirected graphs:

Directed graphs:

Multigraph:

Mixed graph:

Use rules to specify the graph:

Use patterns to select subgraphs:

Find the subgraph with edges that are incident to 3:

Find the subgraph with vertices less than 6:

Subgraph works with large graphs:

Applications  (2)

Select random subgraphs of size 5:

Find all the subgraphs of the graph g that are isomorphic to the graph h:

Enumerate all subsets of vertices that have the same number of vertices as h:

Select the subgraphs that are isomorphic to h:

Highlight them:

Properties & Relations  (3)

The vertices of subgraphs are subsets of the original vertices:

The edges of subgraphs are subsets of the original edges:

The subgraph of a complete graph is a complete graph:

Neat Examples  (1)

Subtract random neighborhoods from a grid:

Wolfram Research (2010), Subgraph, Wolfram Language function, https://reference.wolfram.com/language/ref/Subgraph.html (updated 2015).

Text

Wolfram Research (2010), Subgraph, Wolfram Language function, https://reference.wolfram.com/language/ref/Subgraph.html (updated 2015).

CMS

Wolfram Language. 2010. "Subgraph." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2015. https://reference.wolfram.com/language/ref/Subgraph.html.

APA

Wolfram Language. (2010). Subgraph. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Subgraph.html

BibTeX

@misc{reference.wolfram_2025_subgraph, author="Wolfram Research", title="{Subgraph}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/Subgraph.html}", note=[Accessed: 22-February-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_subgraph, organization={Wolfram Research}, title={Subgraph}, year={2015}, url={https://reference.wolfram.com/language/ref/Subgraph.html}, note=[Accessed: 22-February-2025 ]}