is an option for Tree and related functions that specifies functions to use to generate edge labels.
ParentEdgeLabelFunction
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:
-
Automatic use the keys of any associations as the labelsNone use no labelfunc a general edge label function »
- 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 all close allBasic Examples (4)
Label an individual edge:
Specify a list of edge label functions:
Use no edge labels:
Specify label functions for the leaf and non-leaf edges:
Scope (2)
Specify positions using position patterns:
Specify positions using data patterns:
Properties & Relations (5)
Edges are automatically labeled with the keys of any associations of children:
No labels are used for lists of children:
Labels for edges can be specified by position:
Labels specified by a subtree take precedence over labels specified by its ancestors:
A position {i,j,…} in a subtree refers to its subtree at relative position {i,j,…}:
A relative position {2} at position {1} refers to the global position {1,2}:
In general, a pattern patt applies to subtrees at global positions {i,j,…} that match patt:
A list of patterns {patt1,patt2,…} applies to relative positions {i,j,…} that match the patti:
Related Guides
History
Text
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.
APA
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: 17-November-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: 17-November-2025]}