[R] Help with Functions

Robin Hankin r.hankin at noc.soton.ac.uk
Tue Aug 29 09:09:01 CEST 2006


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



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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> PLEASE do read the posting guide http://www.R-project.org/posting- 
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743

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