Neural Network Question regarding matrix regression

2013 5 6
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I'm new to neural networks.
How can I make a nonlinear regression fit ? My target is a data matrix.
I start nftool and I have Input and Target. What is the input ?

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Greg Heath
Greg Heath 2013-5-14

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x=linspace(0,400,5);
y=linspace(-10,10,11);
X = repmat(x,1,11);
Y = repmat(y,1,5);
Z=(tanh((X+20).*(Y-2)/200)-1)*3;
input = (X; Y);
target = Z;
Hope this helps.
Thank you for formally accepting my answer
Greg

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Greg Heath
Greg Heath 2013-5-7

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The net represents a nonlinear mapping from I-dimensional input vectors to O-dimensional output vectors. The sizes of the input and target matrices are
[ I N ] = size(input)
[ O N ] = size(output)
Hope this helps.
Thank you for formally accepting my answer
Greg
Stephan Moeller
Stephan Moeller 2013-5-14

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I there any example available where I can learn how to understand nntool for :
x=linspace(0,400,5); y=linspace(-10,10,11); [x1,y1]=meshgrid(x,y);
here's my synthetic data z: z=(tanh((x1+20).*(y1-2)/200)-1)*3;
mesh(x1,y1,z)
how do have to configure nntool to calculate a neural network with x,y as inputs and z as the output data ( or target ?? ) .
Stephan Moeller
Stephan Moeller 2013-5-14
编辑：Stephan Moeller 2013-5-14

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Thanks Greg. That works now.
And how can I build the function when nntool is ready ? I can see the weights of the layers, but is possible to get a symbolic function out of it ?

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Greg Heath
Greg Heath 2013-5-14
Practice using nntool on MATLAB's demo/example data sets.
help nndatasets
Then try your data.
The only analytic form you can get from the net is a sum of tanh functions.

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