Coloring - Family of functions

Proposed

Warning

Proposed functions for next mayor release.

• They are not officially in the current release.

• They will likely officially be part of the next mayor release:

  • The functions make use of ANY-INTEGER and ANY-NUMERICAL

  • Name might not change. (But still can)

  • Signature might not change. (But still can)

  • Functionality might not change. (But still can)

  • pgTap tests have being done. But might need more.

  • Documentation might need refinement.

• pgr_sequentialVertexColoring - Proposed - Vertex coloring algorithm using greedy approach.

Experimental

Warning

Possible server crash

• These functions might create a server crash

Warning

Experimental functions

• They are not officially of the current release.

• They likely will not be officially be part of the next release:

  • The functions might not make use of ANY-INTEGER and ANY-NUMERICAL

  • Name might change.

  • Signature might change.

  • Functionality might change.

  • pgTap tests might be missing.

  • Might need c/c++ coding.

  • May lack documentation.

  • Documentation if any might need to be rewritten.

  • Documentation examples might need to be automatically generated.

  • Might need a lot of feedback from the comunity.

  • Might depend on a proposed function of pgRouting

  • Might depend on a deprecated function of pgRouting

• pgr_bipartite -Experimental - Bipartite graph algorithm using a DFS-based coloring approach.

• pgr_edgeColoring - Experimental - Edge Coloring algorithm using Vizing’s theorem.

Result columns

Returns set of (vertex_id, color_id)

Column	Type	Description
vertex_id	BIGINT	Identifier of the vertex.
color_id	BIGINT	Identifier of the color of the vertex. The minimum value of color is 1.

Returns set of (edge_id, color_id)

Column	Type	Description
edge_id	BIGINT	Identifier of the edge.
color_id	BIGINT	Identifier of the color of the edge. The minimum value of color is 1.

See Also

• Boost: Sequential Vertex Coloring algorithm documentation

• Wikipedia: Graph coloring

• Boost: is_bipartite

• Wikipedia: bipartite graph

• Boost: Edge Coloring Algorithm documentation

• Wikipedia: Graph coloring

Indices and tables

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