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RootTree[tree]

returns the root node of tree as a Tree object.

RootTree[tree,n]

returns a Tree object containing the nodes of tree down to level n.

Details and Options
Details and Options Details and Options
Examples  
Basic Examples  
Options  
Styling Individual Tree Elements  
Styling Entire Tree  
Tree Layout and Graphics Options  
Properties & Relations  
See Also
Related Guides
History
Cite this Page

RootTree

RootTree[tree]

returns the root node of tree as a Tree object.

RootTree[tree,n]

returns a Tree object containing the nodes of tree down to level n.

Details and Options

  • RootTree[Tree[data,{subtree1,subtree2,…}]] returns Tree[data,{}].
  • RootTree[Tree[data,None]] gives Tree[data,None].
  • RootTree[tree,n] removes all subtrees on levels below level n.
  • In RootTree[tree,n], the level n can be any machine integer or Infinity.
  • A positive level n+1 consists of all subtrees of tree that are children of subtrees on level n.
  • Level 0 corresponds to the root of the tree.
  • Level -1 corresponds to the leaves.
  • A negative level -(n+1) consists of all subtrees whose children are on levels -1, -2, …, -n, with highest level -n.
  • RootTree takes the same options as Tree.

Examples

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Basic Examples  (3)

Extract the root of a tree:

Remove all subtrees below level 1:

Remove the leaves, keeping nodes down to level -2:

Options  (9)

Styling Individual Tree Elements  (2)

Specify the label for the generated tree element:

Specify labels and styles for subtrees by position:

Styling Entire Tree  (4)

Specify labels and styles for all subtrees:

Specify the base style:

Specify the style for both the edges and the edges of the tree elements:

Specify the base style and styles for individual tree elements:

Tree Layout and Graphics Options  (3)

Specify the orientation for the root:

Specify a named embedding:

Specify Graphics options:

Properties & Relations  (4)

RootTree[tree] gives Tree[TreeData[tree],None] when TreeChildren[tree] gives None:

RootTree[tree] gives Tree[TreeData[tree],{}] when TreeChildren[tree] gives a list:

RootTree[tree] gives Tree[TreeData[tree],<||>] when TreeChildren[tree] gives an association:

RootTree[tree,-1] gives the whole tree:

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

Text

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

CMS

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

APA

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

BibTeX

@misc{reference.wolfram_2025_roottree, author="Wolfram Research", title="{RootTree}", year="2022", howpublished="\url{https://reference.wolfram.com/language/ref/RootTree.html}", note=[Accessed: 11-August-2025]}

BibLaTeX

@online{reference.wolfram_2025_roottree, organization={Wolfram Research}, title={RootTree}, year={2022}, url={https://reference.wolfram.com/language/ref/RootTree.html}, note=[Accessed: 11-August-2025]}