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# noleaves

Determine nonterminal nodes

## Syntax

N = noleaves(T)
N = noleaves(T,'dp')

## Description

N = noleaves(T) returns the indices of nonterminal nodes of the tree T (i.e., nodes that are not leaves). N is a column vector.

The nodes are ordered from left to right as in tree T.

N = noleaves(T,'dp') returns a matrix N, which contains the depths and positions of nonterminal nodes.

N(i,1) is the depth of the i-th nonterminal node and
N(i,2) is the position of the i-th nonterminal node.

## Examples

```% Create initial tree.
ord = 2;
t = ntree(ord,3);        % binary tree of depth 3.
t=nodejoin(t,5);
t=nodejoin(t,4);
plot(t)

% Change Node Label from Depth_Position to Index
% (see the plot function).
```

```% List nonterminal nodes (index).
ntnodes_ind = noleaves(t)

ntnodes_ind =
0
1
2
3
6

% List nonterminal nodes (Depth_Position).
ntnodes_depo = noleaves(t,'dp')

ntnodes_depo =
0     0
1     0
1     1
2     0
2     3
```