[R] Vertical line in densityplot?
Hi all, I'm trying to get a vertical line at a specific point in a densityplot. abline seems to be what's required, but it doesn't align itself to the scale used in the plot. example: library(lattice) x<-rnorm(100) plot.new() densityplot(x) abline(v=0) - The line seems to use some other coordinate system. What kind of call do I use to make abline use the graph's coordinates? Additionally, it would be nice to have standard xy-axis, and to have the line stop at the x-axis, so if anyone could tell me how to do that, I'd be grateful. Thanks in advance, Gustaf PS: a minor question: Why do I have to call plot.new() for abline to work? -- email:[EMAIL PROTECTED] tel: +46(0)703051451 address: Kantorsgatan 50:190 75424 Uppsala Sweden __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Vertical line in densityplot?
I think that you are mixing lattice and base graphics. This works for me: library(lattice) x<-rnorm(100) densityplot(x, panel = function(x, ...) { panel.densityplot(x, ...) panel.abline(v = 0, ...) } ) Gustaf Rydevik a écrit > Hi all, > > I'm trying to get a vertical line at a specific point in a > densityplot. abline seems to be what's required, but it doesn't align > itself to the scale used in the plot. > > example: > > library(lattice) > x<-rnorm(100) > plot.new() > densityplot(x) > abline(v=0) > - > The line seems to use some other coordinate system. What kind of call > do I use to make abline use the graph's coordinates? [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Vertical line in densityplot?
Hi, lattice graphics work by utilizing so called panel functions. Here is a working version of your example: library(lattice) x<-rnorm(100) plot.new() densityplot(x, panel=function(x, ...){ panel.densityplot(x, ...) panel.abline(v=0) } ) For mor information, please look into the examples of densityplot and the help file of panel.abline Hope it helps Thomas Gustaf Rydevik wrote: > Hi all, > > I'm trying to get a vertical line at a specific point in a > densityplot. abline seems to be what's required, but it doesn't align > itself to the scale used in the plot. > > example: > > library(lattice) > x<-rnorm(100) > plot.new() > densityplot(x) > abline(v=0) > - > The line seems to use some other coordinate system. What kind of call > do I use to make abline use the graph's coordinates? > > Additionally, it would be nice to have standard xy-axis, and to have > the line stop at the x-axis, so if anyone could tell me how to do > that, I'd be grateful. What is a "standard x achsis?". > Thanks in advance, > > Gustaf > > > PS: a minor question: Why do I have to call plot.new() for abline to work? > __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Vertical line in densityplot?
On 12/1/06, Thomas Petzoldt <[EMAIL PROTECTED]> wrote: > Hi, > > lattice graphics work by utilizing so called panel functions. Here is a > working version of your example: > > library(lattice) > x<-rnorm(100) > plot.new() > densityplot(x, > panel=function(x, ...){ > panel.densityplot(x, ...) > panel.abline(v=0) > } > ) > > > For mor information, please look into the examples of densityplot and > the help file of panel.abline > > > Hope it helps > > Thomas > Thank you very much! Lattice works somewhat different from "regular" graphics step-by-step addition then. With standard axis, I just meant a set of axis where the x and y axis are represented by lines going through origo, or (0,0). Right now some sort of box is used instead. Thanks again! /Gustaf -- email:[EMAIL PROTECTED] tel: +46(0)703051451 address: Kantorsgatan 50:190 75424 Uppsala Sweden __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.