Neural Network Question regarding matrix regression

4 次查看（过去 30 天）
Stephan Moeller
Stephan Moeller 2013-5-6
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 ?

请先登录，再回答此问题。

采纳的回答

Greg Heath
Greg Heath 2013-5-14
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

更多回答（3 个）

Greg Heath
Greg Heath 2013-5-7
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
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
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 ?
  1 个评论
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.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Sequence and Numeric Feature Data Workflows 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by