hextop

Purpose

Hexagonal layer topology function

Syntax

• pos = hextop(dim1,dim2,...,dimN)
  

Description

hextop calculates the neuron positions for layers whose neurons are arranged in an N-dimensional hexagonal pattern.

hextop(dim1,dim2,...,dimN) takes N arguments,

dimi	Length of layer in dimension i

and returns an N-by-S matrix of N coordinate vectors where S is the product of dim1*dim2*...*dimN.

Examples

This code creates and displays a two-dimensional layer with 40 neurons arranged in an 8-by-5 hexagonal pattern.

• pos = hextop(8,5); plotsom(pos)
  

This code plots the connections between the same neurons, but shows each neuron at the location of its weight vector. The weights are generated randomly, so that the layer is very disorganized, as is evident in the plot generated by the following code.

• W = rands(40,2); plotsom(W,dist(pos))
  

See Also

gridtop, randtop

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