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The result of > plot(c(-1,1),c(-1,1),type="n") > arrows(0,0,1,1) > arrows(0,0,0,0) is not what I expected. The first arrow is drawn correctly. The second does not collapse to a point but goes from (0,0) off to (-infinity,infinity). I guess something is divided by zero in the internal function. Chris. =============================================== platform Windows arch

...1 minor 1.0 year 2000 month June day 15 language R > -----Original Message----- From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk] Sent: Thursday, September 28, 2000 2:16 PM To: r-help at stat.math.ethz.ch; Ritter, Christian C SRTCL-CTGAS Subject: Re: [R] non-ideal behavior in princomp > From: "Ritter, Christian C SRTCL-CTGAS" <Christian.C.Ritter at OPC.shell.com> > Date: Thu, 28 Sep 2000 12:59:25 +0200 > > This problem is not limited to R, but R is one of the packages in which it > arises. I...

...1 minor 1.0 year 2000 month June day 15 language R > -----Original Message----- From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk] Sent: Thursday, September 28, 2000 2:16 PM To: r-help at stat.math.ethz.ch; Ritter, Christian C SRTCL-CTGAS Subject: Re: [R] non-ideal behavior in princomp > From: "Ritter, Christian C SRTCL-CTGAS" <Christian.C.Ritter at OPC.shell.com> > Date: Thu, 28 Sep 2000 12:59:25 +0200 > > This problem is not limited to R, but R is one of the packages in which it > arises. I...

This problem is not limited to R, but R is one of the packages in which it arises. princomp is a nice function which creates an object for which inspection methods have been written. Unfortunately, princomp does not admit cases in which the x matrix is wider than high (i. e. more variables than observations). Such cases are typical in spectroscopy and related disciplines. It would be nice if the

Hi all, I'll have to filter Raman spectra and I would like to do so in R. I'm trying to figure out how. Maybe one of you could help me ... This is what I have to do: General: separate the real spectrum (the set of peaks) from two contaminations: a drifting background and (white) noise Constraints (which should help the task): A - the spectrum is positive B - the spectrum is long

This message is for people who know the mechanics of model.frame within lm. I am fitting lm models for different responses on a data frame which has (at least some) factors. As it happens, some of the responses are NA for some of the factor levels. Logically, lm creates an xlevels list for which the length of levels is different from the original number of levels in the data frame (a

Here is the first one. It concerns the handling of multiple offsets. The following lines creates a list with 3 explanatory variables and one response. > x<-seq(0,1,length=10);y<-sin(x);z<-cos(x); w<-x+y+z+rnorm(x) > data<-list(x=x,y=y,z=z,w=w) A lm is fitted with one explanatory variable and two offsets. So far, so good. >

I'll get to it tomorrow afternoon or on Thursday (if my son isn't sick anymore). Chris. -----Original Message----- From: Deepayan Sarkar [mailto:deepayan at stat.wisc.edu] Sent: Tuesday, January 15, 2002 4:13 AM To: r-announce at stat.math.ethz.ch Subject: new version of lattice A new version of the Lattice package is now available on CRAN. A list of the (mostly minor) changes are