som

Purpose

Creates a Self-Organising Map.

Synopsis 


net = som(nin, map_size)

Description

net = som(nin, map_size) creates a SOM net with input dimension (i.e. data dimension) nin and map dimensions map_size. Only two-dimensional maps are currently implemented.

The fields in net are 


  type = 'som'
  nin = number of inputs
  map_dim = dimension of map (constrained to be 2)
  map_size = grid size: number of nodes in each dimension
  num_nodes = number of nodes: the product of values in map_size
  map = map_dim+1 dimensional array containing nodes
  inode_dist = map of inter-node distances using Manhatten metric

The map contains the node vectors arranged column-wise in the first dimension of the array.

See Also

kmeans, somfwd, somtrain
Pages: Index

Copyright (c) Ian T Nabney (1996-9)