Re: [R] nnet function

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From: Prof Brian Ripley (ripley@stats.ox.ac.uk)
Date: Wed 05 May 2004 - 01:29:43 EST


Message-id: <Pine.LNX.4.44.0405041627090.16360-100000@gannet.stats>

On Tue, 4 May 2004, Tarca Adi Laurentiu wrote:

> Hi I got two questions about the nnet function in R. I would be thankful to
> have an answer.

I don't think you have consulted the book this R code supports: please do
so.

> 1) Does the function intrinsically normalize the X and Y matrices before
> the training, or normalization should be
> done by the user.

The documentation (p.247) answers that.

> 2) I need to understand the $wts matrix. I do imagine that it is a single
> column transformation of the two
> matrices of weighs (input to hidden Ninputs+1 x Nodes) and hidden to output
> (Nodes+1 x Noutputs).

There are no `matrices' of weights, just weights along links in the
network. See the documentation for all the details.

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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