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EdgeLabels

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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

open allclose all

Basic Examples  (3)Summary of the most common use cases

Label the edge 12:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-z5279
Out[1]=1

Use any expression as a label:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-b7zkda
Out[1]=1

Place a label along the edge:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-c75wvu
Out[1]=1

Scope  (14)Survey of the scope of standard use cases

Label Specification  (10)

Label all edges:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-co0g0
In[2]:=2
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https://wolfram.com/xid/09bszj52e-hr4015
Out[2]=2

Use edge names as labels:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-i6o22
Out[1]=1

Use edge indices as labels:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-yott64
Out[1]=1

Use edge weights as labels:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-otg87r
Out[1]=1

EdgeLabels can be used for general graphs:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-w9j3f
Out[1]=1

Matrix graphs:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-fi80b1
Out[1]=1

Special graphs:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-xwdja
Out[1]=1

Random graphs:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-kjdxrt
Out[1]=1

Use EdgeLabels in an Annotation wrapper:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-f4jo2s
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/09bszj52e-earmxu
Out[2]=2

Alternatively, use a Labeled wrapper:

In[3]:=3
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https://wolfram.com/xid/09bszj52e-nmuw
Out[3]=3

EdgeLabels works with patterns:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-64pi0q
Out[1]=1

Label Placement  (4)

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

In[1]:=1
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https://wolfram.com/xid/09bszj52e-fnltmw
Out[1]=1

Use explicit coordinates to place labels:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-ndfa94
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/09bszj52e-bg84f5
Out[2]=2

Place multiple labels using Placed in a wrapper:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-cj2dt
Out[1]=1

Any number of labels can be used:

In[2]:=2
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https://wolfram.com/xid/09bszj52e-dy5run
Out[2]=2

Place multiple labels using EdgeLabels:

In[3]:=3
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https://wolfram.com/xid/09bszj52e-33q72
Out[3]=3

Use automatic labeling by values through Tooltip and StatusArea:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-dhn5kr
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/09bszj52e-bd54a9
Out[2]=2

Possible Issues  (1)Common pitfalls and unexpected behavior

Using Rule to indicate edges does not work:

In[1]:=1
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https://wolfram.com/xid/09bszj52e-crp5pc
Out[1]=1

Use parentheses to get correct parsing:

In[2]:=2
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https://wolfram.com/xid/09bszj52e-bue20b
In[3]:=3
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https://wolfram.com/xid/09bszj52e-m04fnn
In[4]:=4
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https://wolfram.com/xid/09bszj52e-mh35n
Out[4]=4
Wolfram Research (2010), EdgeLabels, Wolfram Language function, https://reference.wolfram.com/language/ref/EdgeLabels.html (updated 2020).
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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).

✖
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.

✖
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

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

BibTeX

@misc{reference.wolfram_2025_edgelabels, author="Wolfram Research", title="{EdgeLabels}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/EdgeLabels.html}", note=[Accessed: 29-March-2025 ]}

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@misc{reference.wolfram_2025_edgelabels, author="Wolfram Research", title="{EdgeLabels}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/EdgeLabels.html}", note=[Accessed: 29-March-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_edgelabels, organization={Wolfram Research}, title={EdgeLabels}, year={2020}, url={https://reference.wolfram.com/language/ref/EdgeLabels.html}, note=[Accessed: 29-March-2025 ]}

✖
@online{reference.wolfram_2025_edgelabels, organization={Wolfram Research}, title={EdgeLabels}, year={2020}, url={https://reference.wolfram.com/language/ref/EdgeLabels.html}, note=[Accessed: 29-March-2025 ]}