neighborhood function in SOM

I am using self organizing map in MATLAB (R2011a) Neural Network Toolbox Version 7.0.1 with "selforgmap()" command. There are several neighborhood function such as gaussian, bubble and so on. However, I could not find any materials where I can set the type of neighborhood function in the code of SOM. Can anyone tell me?

Thank you.

Answer 1

[gunjan]

https://www.mathworks.com/help/nnet/ug/cluster-with-self-organizing-map-neural-network.html#bss4b_l-3

check this.. it says that the weights are updated : W(k+1) = W(k) + alpha * [ (dist) ] rule.. where dist = distance between current neuron that you are updating and the winning neuron. k = iteration number alpha = learning rate