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ParentEdgeLabelFunction
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ParentEdgeLabelFunction

[Experimental]

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is an option for Tree and related functions that specifies functions to use to generate edge labels.

Details

  • ParentEdgeLabelFunction allows specifying the function to generate the label of the parent edge of the root node of a tree, as well as that of any subtrees at positions matching a pattern.
  • The following option settings can be used:
  • Automaticuse the keys of any associations as the labels
    Noneuse no label
    funca general edge label function »
    Allfuncuse label function func for all edges »
    TreeCases[pattern]funcuse func for edges at nodes with data matching pattern »
    "Leaves"funcuse func for edges at leaves »
    "NonLeaves"funcuse func for edges at non-leaves »
    {pos1func1,pos2func2,…}use funci for the edge at relative position posi »
    {patt1func1,patt2func2,…}use funci for edges at positions matching patti »
  • Edge label specifications are effectively applied in the order ParentEdgeLabel, ParentEdgeLabelFunction and ParentEdgeLabelStyle, with later specifications overriding earlier ones.
  • ParentEdgeLabelFunctionfunc specifies that the label of the parent edge of the root node should be provided by func[data], where data is the data in the root.

Examples

open allclose all

Basic Examples  (4)Summary of the most common use cases

Label an individual edge:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-cimrgv
Out[1]=1

Specify a list of edge label functions:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-enfuku
Out[1]=1

Use no edge labels:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-dkcov6
Out[1]=1

Specify label functions for the leaf and non-leaf edges:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-kl1jzc
Out[1]=1

Scope  (2)Survey of the scope of standard use cases

Specify positions using position patterns:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-5m4dzn
Out[1]=1

Specify positions using data patterns:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-u1toiy
Out[1]=1

Properties & Relations  (5)Properties of the function, and connections to other functions

Edges are automatically labeled with the keys of any associations of children:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-5p54ll
Out[1]=1

No labels are used for lists of children:

In[2]:=2
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https://wolfram.com/xid/0rkif21l14rbamq-3j4z7k
Out[2]=2

Labels for edges can be specified by position:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-bfek7x
Out[1]=1

Labels specified by a subtree take precedence over labels specified by its ancestors:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-er5vre
Out[1]=1

A position {i,j,…} in a subtree refers to its subtree at relative position {i,j,…}:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-o4kleh
Out[1]=1

A relative position {2} at position {1} refers to the global position {1,2}:

In[2]:=2
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https://wolfram.com/xid/0rkif21l14rbamq-tm3fnd
Out[2]=2

In general, a pattern patt applies to subtrees at global positions {i,j,…} that match patt:

In[1]:=1
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https://wolfram.com/xid/0rkif21l14rbamq-52bg93
Out[1]=1

A list of patterns {patt1,patt2,…} applies to relative positions {i,j,…} that match the patti:

In[2]:=2
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https://wolfram.com/xid/0rkif21l14rbamq-0x1eq5
Out[2]=2
Wolfram Research (2022), ParentEdgeLabelFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html.
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Wolfram Research (2022), ParentEdgeLabelFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html.

Text

Wolfram Research (2022), ParentEdgeLabelFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html.

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Wolfram Research (2022), ParentEdgeLabelFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html.

CMS

Wolfram Language. 2022. "ParentEdgeLabelFunction." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html.

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Wolfram Language. 2022. "ParentEdgeLabelFunction." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html.

APA

Wolfram Language. (2022). ParentEdgeLabelFunction. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html

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Wolfram Language. (2022). ParentEdgeLabelFunction. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html

BibTeX

@misc{reference.wolfram_2025_parentedgelabelfunction, author="Wolfram Research", title="{ParentEdgeLabelFunction}", year="2022", howpublished="\url{https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html}", note=[Accessed: 24-April-2025 ]}

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@misc{reference.wolfram_2025_parentedgelabelfunction, author="Wolfram Research", title="{ParentEdgeLabelFunction}", year="2022", howpublished="\url{https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html}", note=[Accessed: 24-April-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_parentedgelabelfunction, organization={Wolfram Research}, title={ParentEdgeLabelFunction}, year={2022}, url={https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html}, note=[Accessed: 24-April-2025 ]}

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@online{reference.wolfram_2025_parentedgelabelfunction, organization={Wolfram Research}, title={ParentEdgeLabelFunction}, year={2022}, url={https://reference.wolfram.com/language/ref/ParentEdgeLabelFunction.html}, note=[Accessed: 24-April-2025 ]}