Important: The networks package has been deprecated.  Use the superseding command GraphTheory[Graph] instead.

This procedure generates graphs directly from a set of vertices and a set of vertex pairs.  Each pair of vertices is specified as either a list or a set.  Use of a list indicates direction from the tail to the head.

This routine is normally loaded via the command with(networks) but may also be referenced using the full name networks[graph](...).

$\mathrm{with}\left(\mathrm{networks}\right)\:$

$G≔\mathrm{graph}\left(\left\{1\,2\right\}\,\left\{\left\{1\,2\right\}\right\}\right)\:$

$\mathrm{edges}\left(G\right)$

$\left\{\mathrm{e1}\right\}$

$\mathrm{vertices}\left(G\right)$

$\left\{1\,2\right\}$

$G≔\mathrm{graph}\left(\left\{1\,2\,3\right\}\,\left\{\left[1\,2\right]\,\left\{1\,2\right\}\,\left\{1\,3\right\}\,\left\{2\,3\right\}\right\}\right)\:$

$\mathrm{edges}\left(G\right)$

$\left\{\mathrm{e1}\,\mathrm{e2}\,\mathrm{e3}\,\mathrm{e4}\right\}$

$\mathrm{map}\left(\mathrm{head}\,\,G\right)$

$\left\{2\right\}$