Re: [R] Help with Functions

From: Robin Hankin <r.hankin_at_noc.soton.ac.uk>
Date: Tue 29 Aug 2006 - 17:09:01 EST

Hi

check out R-and-octave.txt on the contributed docs section of CRAN.

HTH Robin

On 28 Aug 2006, at 17:50, Lord Tyranus wrote:

> Hello wizards, I need to convert the following functions (prestd,
> poststd, prepca) of matlab to R. Does Somebody knows how to do it. A
> description of the functions is:
>
> prestd preprocesses the network training set by normalizing the inputs
> and targets so that they have means of zero and standard deviations of
> 1.
>
> poststd postprocesses the network training set which was preprocessed
> by prestd. It converts the data back into unnormalized units.

>
> prepca preprocesses the network input training set by applying a
> principal component analysis. This analysis transforms the input data
> so that the elements of the input vector set will be uncorrelated. In
> addition, the size of the input vectors may be reduced by retaining
> only those components which contribute more than a specified fraction
> (min_frac) of the total variation in the data set.
>
> Thanks in advance.
>
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--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743

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Received on Tue Aug 29 17:14:30 2006

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