Savitzky-Golay smoothing for reflectance data

Hi all,
I'd like to generate a number of plots to compare different
vectors I have stored in a list. To do this I do something like
(in a linux system):

for(i in 1:L) {
 X11()
 plot(listOfFunctions[[i]])
}

First question is: is this the right way to create several plots (in
different windows) ?
Second question: what are the corresponding commands for the matlab
'figure(n)' to activate a certain figure and 'close(1:n)' to close
several figures at once?

Thank you,
Giampiero

Don't need to answer to my previous post: I found the functions in the
meantime:

     dev.cur()
     dev.list()
     dev.next(which = dev.cur())
     dev.prev(which = dev.cur())
     dev.off(which = dev.cur())
     dev.set(which = dev.next())
     graphics.off()

Thanks anyway,
Giampiero

Hi all,
I'd like to generate a number of plots to compare different
vectors I have stored in a list. To do this I do something like
(in a linux system):

for(i in 1:L) {
 X11()
 plot(listOfFunctions[[i]])
}

First question is: is this the right way to create several plots (in
different windows) ?
Second question: what are the corresponding commands for the matlab
'figure(n)' to activate a certain figure and 'close(1:n)' to close
several figures at once?

Thank you,
Giampiero

Hi,
	Quote:

	"The Savitzky-Golay smoothing turns out to be exactly equivalent to fitting
data to a polynomial as described" (Skoog, Holler and Nieman, Principles of
Instrumental Analysis, pp 111)

	While R is not a tool for instrumental analysis, I am sure you can find
smoothing methods that will suit your problem in R (there are plenty of
them). There is a thread on this topic on this from March 2003 where Andy
Liaw points to the KernSmooth package.

http://maths.newcastle.edu.au/~rking/R/help/03a/2995.html

all the best,

Jesus

--------------------------------------------------------------
Jes?s Mar?a Fr?as Celayeta
School of Food Sci. and Env. Health.
Faculty of Tourism and Food
Dublin Institute of Technology
Cathal Brugha St., Dublin 1. Ireland
Phone: +353 1 4024459 Fax: +353 1 4024495
http://www.dit.ie/DIT/tourismfood/science/staff/frias.html
--------------------------------------------------------------

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Andersson, Henrik
Sent: 05 February 2004 15:13
To: r-help at stat.math.ethz.ch
Subject: [R] Savitzky-Golay smoothing for reflectance data


I got a question from a fellow PhD student that work with spectrum
analysis in Excel and now he has lots of spectrums that needs to be
smoothed, which would be nice to be able to do in batch.

Is there an R package that can do:

Savitzky-Golay smoothing for reflectance spectral data

or a function that does something similar.

_______________________________________
Henrik Andersson
Netherlands Insitute of Ecology
h.andersson at nioo.knaw.nl

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