Hi, Suppose I already have two plots on the same screen, and I want to draw lines in each of them. Is that possible in R? It seems that once you have two plots on the screen, you can only draw lines in the the last plot, never the 1st. Here is what I mean: #some data y1=rnorm(1:3) y2=rnorm(1:3) #draw two plots on the same screen par(mfrow=c(2,1),oma = c(6, 0, 5, 0)) par(mar=c(0, 5.1, 0, 5.1)) plot(y1,xaxt="n",type="n") #1st plot par(mar=c(0, 5.1, 0, 5.1)) plot(y2,xaxt="n",type="n") #2nd plot #try to draw lines onto each plot on the screen lines(y2) #draws a line in the 2nd plot lines(y1,col=2) #also draws a line in the 2nd plot, but that's not what I want. I want to draw the line in the 1st plot instead. Does anyone know if after more than one plot were drawn, can I still call the 1st plot and draw a line in it? Thanks, -- Tom [[alternative HTML version deleted]]

Try this: #some data y1=rnorm(1:3) y2=rnorm(1:3) #draw two plots on the same screen par(mfrow=c(2,1),oma = c(6, 0, 5, 0)) par(mar=c(0, 5.1, 0, 5.1)) plot(y1,xaxt="n",type="n") #1st plot par(mar=c(0, 5.1, 0, 5.1)) plot(y2,xaxt="n",type="n") #2nd plot #try to draw lines onto each plot on the screen lines(y2) #draws a line in the 2nd plot par(mfg=c(1, 1)) lines(y1,col=2) #also draws a line in the 2nd plot, but that's not what I On 24/01/2008, tom soyer <tom.soyer at gmail.com> wrote:> Hi, > > Suppose I already have two plots on the same screen, and I want to draw > lines in each of them. Is that possible in R? It seems that once you have > two plots on the screen, you can only draw lines in the the last plot, never > the 1st. Here is what I mean: > > #some data > y1=rnorm(1:3) > y2=rnorm(1:3) > > #draw two plots on the same screen > par(mfrow=c(2,1),oma = c(6, 0, 5, 0)) > par(mar=c(0, 5.1, 0, 5.1)) > plot(y1,xaxt="n",type="n") #1st plot > par(mar=c(0, 5.1, 0, 5.1)) > plot(y2,xaxt="n",type="n") #2nd plot > > #try to draw lines onto each plot on the screen > lines(y2) #draws a line in the 2nd plot > lines(y1,col=2) #also draws a line in the 2nd plot, but that's not what I > want. I want to draw the line in the 1st plot instead. > > Does anyone know if after more than one plot were drawn, can I still call > the 1st plot and draw a line in it? > > Thanks, > > -- > Tom > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org 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. >-- Henrique Dallazuanna Curitiba-Paran?-Brasil 25? 25' 40" S 49? 16' 22" O

Look at the examples for cnvrt.coords in the TeachingDemos package, they might give you some ideas to accomplish what you want. -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.snow at imail.org (801) 408-8111> -----Original Message----- > From: r-help-bounces at r-project.org > [mailto:r-help-bounces at r-project.org] On Behalf Of tom soyer > Sent: Wednesday, January 23, 2008 8:14 PM > To: r-help at r-project.org > Subject: [R] plot help > > Hi, > > Suppose I already have two plots on the same screen, and I > want to draw lines in each of them. Is that possible in R? It > seems that once you have two plots on the screen, you can > only draw lines in the the last plot, never the 1st. Here is > what I mean: > > #some data > y1=rnorm(1:3) > y2=rnorm(1:3) > > #draw two plots on the same screen > par(mfrow=c(2,1),oma = c(6, 0, 5, 0)) > par(mar=c(0, 5.1, 0, 5.1)) > plot(y1,xaxt="n",type="n") #1st plot > par(mar=c(0, 5.1, 0, 5.1)) > plot(y2,xaxt="n",type="n") #2nd plot > > #try to draw lines onto each plot on the screen > lines(y2) #draws a line in the 2nd plot > lines(y1,col=2) #also draws a line in the 2nd plot, but > that's not what I want. I want to draw the line in the 1st > plot instead. > > Does anyone know if after more than one plot were drawn, can > I still call the 1st plot and draw a line in it? > > Thanks, > > -- > Tom > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org 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. >