Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Library: xclust
See also: cartsplit cartsplitopt cartcv maketr pred prederr prune prunecv pruneseq prunetot ssr kuva

Quantlet: leafnum
Description: Gives the number of leaves (terminal nodes) in a regression tree.

Usage: ln = leafnum(cs, node)
Input:
cs list of vectors: data structure which represents a binary tree and is produced by cartsplit procedure, contains vectors cs.val, cs.vec, cs.mean, cs.ssr, cs.nelem. See cartsplit for the description of cs.
node integer >= 1: gives the index of the root node of the subtree whose number of leaves will be calculated. If node=1, the number of leaves in the hole tree is calculated, if node=2, the number of leaves in the left subtree is calculated, if node=3, the number of leaves in the left subtree of the left subtree (if it exists) is calculated. See cartsplit for the explanation how the tree is represented as a vector.
Output:
ln integer >= 1: number of leaves in the specified subtree.

Example:

; loads the library xclust

library ("xclust")

;let us generate a tree by cartsplit procedure

x1=#(0,0,0,0,1,1,1,1,1,2)

x2=#(0,0,0,0,0,0,0,1,1,1)

x=x1~x2

y=#(0,0,0,0,100,100,100,120,120,120)

cs=cartsplit(x,y,#(0,1))

cs

ln1=leafnum(cs,1)

ln1

ln2=leafnum(cs,2)

ln2

ln3=leafnum(cs,3)

ln3

Result:



Content of object cs.val.split0

[1,] 0 

[2,] 1,2 

Content of object cs.val.split1

[1,] NaN 

Content of object cs.val.split2

[1,] 0 

Content of object cs.val.split3

[1,] NaN 

Content of object cs.val.split4

[1,] NaN 

Content of object cs.vec

[1,] 1.000000 

[2,] NaN 

[3,] 2.000000 

[4,] NaN 

[5,] NaN 

Content of object cs.mean

[1,] 66.000000 

[2,] 0.000000 

[3,] 110.000000 

[4,] 100.000000 

[5,] 120.000000 

Content of object cs.var

[1,] 29640.000000 

[2,] 0.000000 

[3,] 600.000000 

[4,] 0.000000 

[5,] 0.000000 

Content of object cs.nelem

[1,] 10.000000 

[2,] 4.000000 

[3,] 6.000000 

[4,] 3.000000 

[5,] 3.000000 

Content of object ln1

[1,] 3.000000

Content of object ln2

[1,] 1.000000

Content of object ln3

[1,] 2.000000


Library: xclust
See also: cartsplit cartsplitopt cartcv maketr pred prederr prune prunecv pruneseq prunetot ssr kuva

Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Author: Jussi Klemelae, 980323
(C) MD*TECH Method and Data Technologies, 21.9.2000