Extract the equation of the neural network

Hi guys, please help me with neural network topic, can you extract the equation of neural networks Matlab, to be use in Excel (read the whole equation) and publish in a slideshow, yes or no and why (documentation).

There is a document which can be read to see if it is possible or not. For what serving this equation "(y = b2 + LW * tansig (b1 + IW * x)", i read for the weight but can you teach me.

And, there is a neural network program that can deliver the equation. My job consists 9 variables of input and 1 output, trying to relate events of nature, precipitation -》soil erosion.

pleaseeeeee help me, i read a lot topic about neural network but anyone can say explicit and educative way the solution.

Pleaseeeeeeeee i need help

Answer 1

[Greg Heath]

There are 7 basic NNs in the NN Toolbox. Although they all have default configurations, very often modifications are used. I don't know of any program that will automatically yield the analytic input/output relationship of an arbitrary net.

The command

 view(net)

will yield a visual representation, from which a non-beginner can piece together the analytic representation for a nonstandard configuration.

However, there doesn't seem to be an easy out for the beginner.

My recommendation is to first learn the configurations and corresponding analytic representations for the following

 1. FITNET
 2. PATTERNNET
 3. TIMEDELAYNET
 4. NARNET
 5. NARXNET

Then you will be better prepared to deal with the less standard configurations.

Hope this helps.

[Greg Heath]

The final 2 of the 7 I mentioned are

 FEEDFORWARDNET - Basic multilayer perceptron (MLP) that is 
called by FITNET and PATTERNNET

 SELFORGMAP - Self organizing map for clustering data into 
similarity groups. Useful for visualizing multidimensional 
data in a 2 dimensional representation.

Hope this helps.

Greg

Answer 2

[Walter Roberson]

It appears to me that the equations that can be derived are difficult to interpret; see http://www.mathworks.com/matlabcentral/newsreader/view_thread/62107

For one calculation, see http://www.mathworks.com/matlabcentral/answers/77298-equation-and-neural-networks