neural network in ecology-data-analysis

From: Federico Spinazzi (
Date: Sat Apr 04 1998 - 10:14:22 MET DST

Dear adelisters,

I'm currently using some kind of Artificial neural network ANN) for

Why bother you with such things ?

While developing my program for Bray-Curtis ordination, I built an
artificial data set. It contains 400 sites, disposed on an immaginary +,
200 vertically and 200 horizontaly.

On each 200-group, I tried to simulate two perpendicular gradients, using
gaussian response to gradient for species abundance. The species are 10.

I've tried classical ordination on such a table. The main point I want to
point (!) out is that Self-Organizing Features Maps succed in separating
the 400 sites in two cluster: one for the horizontal axis and the second
for the vertical one.

the code I've used could be ftp'ed (what an awful expression for french
lovers ! I'm sorry.) from:

I'll like some feedback from you all.

Federico Spinazzi

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