Problem with mathematical expression of neural network

Hello,

I am using 'feedforwardnet' to model ANN. After training ANN, I use 'getNeuralNetExpression()' to obtain symbolic expression of neural network. When this expression is applied on set of input values in MS Excel, I get a wrong output. But when I use net() function on input values in MATLAB, I get output close to the target values. What may be the reason for this? Input values are not normalized to (0 1) range. Is this problem related to normalization of inputs?

Answer 1

[Greg Heath]

You can answer that question better than we can.

Normalize your data and see what happens.

Or am I missing something ???

Greg

Answer 2

[Ilias]

If you haven't changed the default setting, inputs are normalized at [-1 1]. https://se.mathworks.com/help/nnet/ug/choose-neural-network-input-output-processing-functions.html

You can use the genFunction instead: https://se.mathworks.com/help/nnet/ref/genfunction.html