Statistics Toolbox™

isbranch - Test node for branch

Class

@classregtree

Syntax

ib = isbranch(t) ib = isbranch(t,nodes)

Description

ib = isbranch(t) returns an n-element logical vector ib that is true for each branch node and false for each leaf node.

ib = isbranch(t,nodes) takes a vector nodes of node numbers and returns a vector of logical values for the specified nodes.

Example

Create a classification tree for Fisher's iris data:

load fisheriris;

t = classregtree(meas,species,...
                 'names',{'SL' 'SW' 'PL' 'PW'})
t = 
Decision tree for classification
1  if PL<2.45 then node 2 else node 3
2  class = setosa
3  if PW<1.75 then node 4 else node 5
4  if PL<4.95 then node 6 else node 7
5  class = virginica
6  if PW<1.65 then node 8 else node 9
7  class = virginica
8  class = versicolor
9  class = virginica

view(t)

ib = isbranch(t)
ib =
     1
     0
     1
     1
     0
     1
     0
     0
     0

Reference