plotsom :: Functions (Neural Network Toolbox™)

Neural Network Toolbox™

plotsom

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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

`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)

`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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plotroc plotsomhits

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