Tree Properties & Measurements

The Wolfram Language allows testing basic properties of trees, as well as computing general properties that leverage powerful functionality from the rest of the Wolfram Language. The data and subtrees in trees can be extracted by position, level, pattern matching or with arbitrary properties. Structural measurements such as the number of children or subtrees satisfying some property can be efficiently computed. Input and output are given in a form compatible with the rest of the Wolfram Language, allowing easy interoperability.

Basic Properties

TreeQ test whether an expression is a tree object

TreeLeafQ test whether a tree is a leaf

Basic Measurements

TreeData give the data in a tree

TreeChildren give the child subtrees of a tree

TreeSize give the number of subtrees of a tree

TreeDepth give the maximum level of a tree


TreeLeaves the list of leaves of a tree

TreeLevel the list of subtrees specified by a given number of indices

TreeCases list of subtrees matching a pattern

TreePosition positions of subtrees matching a pattern

TreeCount number of subtrees matching a pattern

TreeSelect list of subtrees satisfying a criterion

Positions in Trees

TreeExtract extract parts of a tree at the specified positions

TreeLevel, TreeCases, TreeSelect operator forms representing positions