Purpose

Plot self-organizing map

Syntax

• plotsom(pos)
  plotsom(W,D,ND)
  

Description

plotsom(pos) takes one argument,

POS	N x S matrix of S N-dimension neural positions

and plots the neuron positions with red dots, linking the neurons within a Euclidean distance of 1.

plotsom(W,D,ND) takes three arguments,

W	S x R weight matrix
D	S x S distance matrix
ND	Neighborhood distance (default = 1)

and plots the neuron's weight vectors with connections between weight vectors whose neurons are within a distance of 1.

Examples

Here are some neat plots of various layer topologies.

• pos = hextop(5,6); plotsom(pos)
  pos = gridtop(4,5); plotsom(pos)
  pos = randtop(18,12); plotsom(pos)
  pos = gridtop(4,5,2); plotsom(pos)
  pos = hextop(4,4,3); plotsom(pos)
  

See newsom for an example of plotting a layer's weight vectors with the input vectors they map.

See Also

initsompc, learnsom, newsom

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