MATLAB: Do i have to normalize the input as well as output data while using newff function for neural network

newff

i am using Matlab 7.8.0 (R2009a) version. when i want to use newff function do i need to normalize the data in [-1 1] interval or the function itself normalize the data.

Best Answer

NEWFF will automatically normalize input and target, then use the target statistics to unnormalize the output.

First run the examples in the command line documentation

 help newff
 doc newff

then use the other examples obtained from

 help nndatasets
 doc nndatasets.

Hope this helps.

Thank you for formally accepting my answer

Greg

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MATLAB: Newff

There are many examples in ANSWERS and the NEWSGROUP. The pattern-recognition/classification function newpr calls newff. However they have been replaced by patternnet and feedforwardnet, respectfully.

In addition to the documentation examples in help and doc, there are several test data sets obtained from

 help nndatssets
 doc nndatasets

MATLAB: How to normalize well data between [-1,1]

Well, think about it! Without knowledge of the scaling and translation done, how could you possibly regenerate the original data? If you discard information content, that information is lost.

Were you to save that information, (i.e., the min and max of your data) then it is trivial to reverse the normalization.

And of course the two alternatives you list don't work, since both a translation and scaling are needed to achieve the final range you desire.

Best Answer

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MATLAB: Newff

MATLAB: How to normalize well data between [-1,1]

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