noleaves

R2026b

Determine nonterminal nodes

Syntax

N = noleaves(T)

N = noleaves(T,"dp")

Description

noleaves is a tree-management utility.

N = noleaves(T) returns the indices of the nonterminal nodes of the tree T in the column vector N. The nodes are ordered from left to right and from top to bottom. The root index is 0.

N = noleaves(T,"dp") returns the depths and positions of the nonterminal nodes. N(i,1) is the depth and N(i,2) is the position of the ith nonterminal node.

Examples

Determine Nonterminal Nodes

Create a binary tree of depth 3.

ord = 2;
t = ntree(ord,3);

Merge the nodes with indices 4 and 5. Plot the tree.

t = nodejoin(t,5);
t = nodejoin(t,4);
fig = plot(t);

Programmatically, in Node Label, change the selected item from Depth_Position to Index.

plot(t,"setNodeLabel",fig,"Index")

List the indices of the nonterminal nodes.

noleaves(t)

ans = 5×1

     0
     1
     2
     3
     6

List the depth-position of the nonterminal nodes.

noleaves(t,"dp")

ans = 5×2

     0     0
     1     0
     1     1
     2     0
     2     3

Input Arguments

T — Tree

dtree object | ntree object | wptree object

Tree, specified as a dtree, ntree, or wptree object.

Output Arguments

N — Nonterminal node description

vector | matrix

Nonterminal node description, returned as a column vector or matrix. The nodes are numbered from left to right as in the tree T. The root index is 0.

• If N = noleaves(T), N is a P-by-1 column vector, where P is the number of nonterminal nodes in the tree. N(i) is the index of the ith nonterminal node.

• If N = noleaves(T,"dp"), N is a P-by-2 matrix. N(i,1) is the depth and N(i,2) is the position of the ith nonterminal node.

Extended Capabilities

Thread-Based Environment

Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.

The noleaves function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.

Version History

Introduced before R2006a

R2026b: Use thread-based environments

You can use noleaves in thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.