Dear karin,
Try rescaler from the reshape package:
install.packages("reshape")
library("reshape")
newDF <- apply(oldDF, 2, rescaler, type = "sd")
HTH,
Thierry
------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
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tel. + 32 54/436 185
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say what the experiment died of.
~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data.
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The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
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-----Oorspronkelijk bericht-----
Van: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
Namens Karin Lagesen
Verzonden: donderdag 16 april 2009 12:29
Aan: r-help@r-project.org
Onderwerp: Re: [R] performing function on data frame
David Hajage <dhajag...@gmail.com> writes:
> Hi Karin,
>
> I'm not sure I understand... Is this what you want ?
>
> d$y - mean(d$y)/sd(d$y)
Yes, and also a bit no.
Each column in my data frame represents one data set. For every
element in this data set I want to know the z value for that
element. I.e: I want to create a new data frame from the old data
frame, where each element in the new data frame is
newDF[i,j] = oldDF[i,j] - mean(d[,j]) / sddev(d[,j])
I could, I think, iterate like this over the data frame, but I keep
thinking that one of the apply functions should be employed...
Karin
--
Karin Lagesen, Ph.D.
karin.lage...@medisin.uio.no
http://folk.uio.no/karinlag
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