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EdgeLabels—Wolfram Documentation

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EdgeLabels

is an option and annotation for Graph and related functions that specifies what labels and label positions should be used for edges.

Details
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
Label Specification  
Label Placement  
Possible Issues  
See Also
Related Guides
History
Cite this Page

EdgeLabels

EdgeLabels

is an option and annotation for Graph and related functions that specifies what labels and label positions should be used for edges.

Details

  • The following option settings can be used:
  • Noneuse no edge labels
    "Index"use the edge index as a label
    "Name"use the edge name as a label
    "EdgeWeight"use the edge weight as a label
    "EdgeTag"use the edge tag as a label
    {vivj->lblij,…}label edge vivj with lblij etc.
    {pattilbli,…}use lbli for edges matching the pattern patti
  • The wrapper Labeled[vivj,lbl] is equivalent to Annotation[vivj,EdgeLabels->lbl] and can be used when creating graphs in functions such as Graph etc.
  • Labeled[vivj,lbl,pos] and Placed[lbl,pos] can be used to place labels along an edge.
  • The following positions pos can be used for Labeled and Placed in positioning edge labels:
  • Tooltip,StatusAreashow as tooltip or in status area on mouseover
    "Start","Middle","End"place label at start, middle, or end
    {Left,pos},{Right,pos}place label left or right of the edge at symbolic position
    {s,{lx,ly}}scaled position {lx,ly} in the label at scaled position s along the edge
  • The scaled position along the edge curve represents the fraction of the total length: e.g. places the edge label at the halfway point.

Examples

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Basic Examples  (3)

Label the edge 12:

Wolfram Language code: CompleteGraph[5, EdgeLabels -> {12 -> "hello"}]

Use any expression as a label:

Wolfram Language code: Graph[{12, 23, 31}, EdgeLabels -> {23 -> [image], 31 -> [image]}]

Place a label along the edge:

Wolfram Language code: Table[CompleteGraph[3, EdgeLabels -> {12 -> Placed["hello", p]}, ImagePadding -> 10, PlotLabel -> p], {p, {"Start", "Middle", "End"}}]

Scope  (14)

Label Specification  (10)

Label all edges:

Wolfram Language code: el = {12, 23, 31};
Wolfram Language code: Graph[el, EdgeLabels -> Table[el[[i]] -> Subscript[e, i], {i, Length[el]}]]

Use edge names as labels:

Wolfram Language code: Graph[{12, 23, 31}, EdgeLabels -> "Name"]

Use edge indices as labels:

Wolfram Language code: Graph[{12, 23, 31}, EdgeLabels -> "Index"]

Use edge weights as labels:

Wolfram Language code: Graph[{12, 23, 31}, EdgeWeight -> {3, 2, 1}, EdgeLabels -> "EdgeWeight"]

EdgeLabels can be used for general graphs:

Wolfram Language code: {Graph[{12, 23, 31}, EdgeLabels -> {12 -> "hello"}], PathGraph[Range[25], EdgeLabels -> {12 -> "hello"}]}

Matrix graphs:

Wolfram Language code: AdjacencyGraph[{{0, 1, 1}, {1, 0, 1}, {1, 1, 0}}, EdgeLabels -> {12 -> "hello"}]

Special graphs:

Wolfram Language code: {PetersenGraph[5, 2, EdgeLabels -> {89 -> "hello"}], GridGraph[{3, 3}, EdgeLabels -> {25 -> "hello"}]}

Random graphs:

Wolfram Language code: RandomGraph[{3, 3}, EdgeLabels -> {12 -> "hello"}]

Use EdgeLabels in an Annotation wrapper:

Wolfram Language code: Graph[{12, 23, Annotation[31, EdgeLabels -> "hello"]}]
Wolfram Language code: HighlightGraph[GridGraph[{2, 3}], Annotation[13, EdgeLabels -> "hello"]]

Alternatively, use a Labeled wrapper:

Wolfram Language code: Graph[{12, 23, Labeled[31, "hello"]}]

EdgeLabels works with patterns:

Wolfram Language code: CompleteGraph[5, EdgeLabels -> {_2 -> "Name"}]

Label Placement  (4)

Use Placed with symbolic locations to control label placement along an edge:

Wolfram Language code: Table[Graph[{12, 23, 31}, EdgeLabels -> {12 -> Placed["■■■", p]}, PlotLabel -> p, ImagePadding -> 5], {p, {"Start", "Middle", "End"}}]

Use explicit coordinates to place labels:

Wolfram Language code: Table[Graph[{12, 23, 31}, EdgeLabels -> {12 -> Placed["■■■", p]}, PlotLabel -> p, BaselinePosition -> Axis, ImagePadding -> 5], {p, {0, 1 / 4, 1 / 3}}]
Wolfram Language code: Table[Graph[{12, 23, 31}, EdgeLabels -> {12 -> Placed["■■■", {1 / 2, p}]}, PlotLabel -> p, BaselinePosition -> Axis, ImagePadding -> 5], {p, {{0, 0}, {1 / 2, 1 / 2}, {1, 1}}}]

Place multiple labels using Placed in a wrapper:

Wolfram Language code: Graph[{12, 23, Labeled[31, Placed[{"lbl1", "lbl2"}, {"Start", "End"}]]}]

Any number of labels can be used:

Wolfram Language code: Graph[{12, 23, Labeled[31, Placed[{"lbl1", "lbl2", "lbl3"}, {"Start", "Middle", "End"}]]}]

Place multiple labels using EdgeLabels:

Wolfram Language code: Graph[{12, 23, 31}, EdgeLabels -> {31 -> Placed[{"lbl1", "lbl2"}, {"Start", "End"}]}]

Use automatic labeling by values through Tooltip and StatusArea:

Wolfram Language code: CompleteGraph[5, EdgeLabels -> Placed["Name", Tooltip]]
Wolfram Language code: CompleteGraph[5, EdgeLabels -> Placed["Name", StatusArea]]

Possible Issues  (1)

Using Rule to indicate edges does not work:

Wolfram Language code: Graph[{1 -> 2, 2 -> 3, 3 -> 1}, EdgeLabels -> {1 -> 2 -> "Hello"}]

Use parentheses to get correct parsing:

Wolfram Language code: 1 -> 2 -> "Hello"//FullForm
Wolfram Language code: (1 -> 2) -> "Hello"//FullForm
Wolfram Language code: Graph[{1 -> 2, 2 -> 3, 3 -> 1}, EdgeLabels -> {(1 -> 2) -> "Hello"}]
Wolfram Research (2010), EdgeLabels, Wolfram Language function, https://reference.wolfram.com/language/ref/EdgeLabels.html (updated 2020).

Text

Wolfram Research (2010), EdgeLabels, Wolfram Language function, https://reference.wolfram.com/language/ref/EdgeLabels.html (updated 2020).

CMS

Wolfram Language. 2010. "EdgeLabels." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/EdgeLabels.html.

APA

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

BibTeX

@misc{reference.wolfram_2026_edgelabels, author="Wolfram Research", title="{EdgeLabels}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/EdgeLabels.html}", note=[Accessed: 14-November-2026]}

BibLaTeX

@online{reference.wolfram_2026_edgelabels, organization={Wolfram Research}, title={EdgeLabels}, year={2020}, url={https://reference.wolfram.com/language/ref/EdgeLabels.html}, note=[Accessed: 14-November-2026]}