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<html>
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<title>
Netlab Reference Manual som
</title>
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<body>
<H1> som
</H1>
<h2>
Purpose
</h2>
Creates a Self-Organising Map.
<p><h2>
Synopsis
</h2>
<PRE>
net = som(nin, map_size)
</PRE>
<p><h2>
Description
</h2>
<CODE>net = som(nin, map_size)</CODE> creates a SOM <CODE>net</CODE>
with input dimension (i.e. data dimension) <CODE>nin</CODE> and map dimensions
<CODE>map_size</CODE>. Only two-dimensional maps are currently implemented.
<p>The fields in <CODE>net</CODE> are
<PRE>
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
</PRE>
<p>The map contains the node vectors arranged column-wise in the first
dimension of the array.
<p><h2>
See Also
</h2>
<CODE><a href="kmeans.htm">kmeans</a></CODE>, <CODE><a href="somfwd.htm">somfwd</a></CODE>, <CODE><a href="somtrain.htm">somtrain</a></CODE><hr>
<b>Pages:</b>
<a href="index.htm">Index</a>
<hr>
<p>Copyright (c) Ian T Nabney (1996-9)
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