Hi, Still fresh in R, tried to figure this out, now on my second day running with no luck (and a pile of hair on my desk) so I have thrown in the towel and would like to ask for some help. Here is what I am trying to do. I am trying to plot a distribution, I have 99 points, bound in the range xlim.min: -0.0173 xlim.max: 0.02103 However, I have a value outside this range (0.2454959) which I would like to add to the plot as a line and to do this I use abline(v=0.2454959) This is what I write >xlim = c(-0.02, 0.3) >denz <- density(morp) >plot.density(denz, xlim = xlim, ylim = c(0,70)) >hist(morp, freq=F, add= T) >abline(v=0.2454959) Without any options, plot.density spreads out nicely, however, naturally, the line I want to add is not plotted since it is well outside the range automatically determined by plot.density hence the need to add xlim however this produces something I dont find aesthetically appealing. The plot is squeezed out into a very lean "bell" shape. So (finally) my question, how can i widen the spread of my plot and yet also be able to add my xline. Many thanks Ronnie
Please give an example of your data. set.seed(231) morp <- rnorm(20) range(morp) [1] -2.311664 1.650254 You can plot 2 histograms, one of them with the extreme value: par(mfrow=c(2,1)) hist(morp, breaks=10, freq=F) lines(density(morp)) par(mfrow=c(1,2)) hist(morp, breaks=10, freq=F) lines(density(morp)) hist(morp, breaks=seq(min(morp), max(morp), length=10), xlim=c(-3, 13), freq=F) lines(density(morp)) abline(v=7.5, lty=3) Ronnie Babigumira a ??crit :>Hi, >Still fresh in R, tried to figure this out, now on my second day running with no luck (and a pile of hair on my desk) so >I have thrown in the towel and would like to ask for some help. > >Here is what I am trying to do. I am trying to plot a distribution, I have 99 points, bound in the range > >xlim.min: -0.0173 >xlim.max: 0.02103 > >However, I have a value outside this range (0.2454959) which I would like to add to the plot as a line and to do this I >use abline(v=0.2454959) > >This is what I write > > >xlim = c(-0.02, 0.3) > >denz <- density(morp) > >plot.density(denz, xlim = xlim, ylim = c(0,70)) > >hist(morp, freq=F, add= T) > >abline(v=0.2454959) > >Without any options, plot.density spreads out nicely, however, naturally, the line I want to add is not plotted since it >is well outside the range automatically determined by plot.density hence the need to add xlim however this produces >something I dont find aesthetically appealing. The plot is squeezed out into a very lean "bell" shape. > >So (finally) my question, how can i widen the spread of my plot and yet also be able to add my xline. > >Many thanks > >Ronnie > >______________________________________________ >R-help at 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 > > >
Ronnie Babigumira <rb.glists <at> gmail.com> writes:
It sounds like you might want to break your axis.
plotrix provides a function to draw the axis break,
but you have to mess around with the data scaling
and axis labels yourself. See RSiteSearch("axis
break"); most of these discussions
are about breaking y axes but the same techniques
apply to the x axis.
good luck,
Ben Bolker
Hi, I believe Jim Lemon's solution requires his plotrix package. Maurice Haynes National Institutes of Health Child and Family Research Section -----Original Message----- From: Jim Lemon [mailto:bitwrit at ozemail.com.au] Sent: Friday, December 23, 2005 10:12 PM To: Ronnie Babigumira Cc: R Help Subject: Re: [R] Plot problems: xlim Ronnie Babigumira wrote:> Hi, > Still fresh in R, tried to figure this out, now on my second dayrunning with no luck (and a pile of hair on my desk) so> I have thrown in the towel and would like to ask for some help. > > Here is what I am trying to do. I am trying to plot a distribution, Ihave 99 points, bound in the range> > xlim.min: -0.0173 > xlim.max: 0.02103 > > However, I have a value outside this range (0.2454959) which I wouldlike to add to the plot as a line and to do this I> use abline(v=0.2454959) > > This is what I write > > >xlim = c(-0.02, 0.3) > >denz <- density(morp) > >plot.density(denz, xlim = xlim, ylim = c(0,70)) > >hist(morp, freq=F, add= T) > >abline(v=0.2454959) > > Without any options, plot.density spreads out nicely, however,naturally, the line I want to add is not plotted since it> is well outside the range automatically determined by plot.densityhence the need to add xlim however this produces> something I dont find aesthetically appealing. The plot is squeezedout into a very lean "bell" shape.> > So (finally) my question, how can i widen the spread of my plot andyet also be able to add my xline.>Hi Ronnie, For only one line, it is probably easiest to stick in an axis break and label the line on the x axis. Notice that the position of the line is arbitrarily set to be far enough beyond the end of the density curve to allow room for the axis break. testdata<-rnorm(50,sd=0.01) denz<-density(testdata) plot(denz,xlim=c(-0.02,0.04),axes=FALSE) box() axis(1,at=c(-0.02,0,0.02,0.039),labels=c(-0.02,0,0.02,0.2454959)) abline(v=0.039) axis.break(1,breakpos=0.037) This is probably a common enough problem for inclusion in the axis.break example. Jim ______________________________________________ R-help at 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
> Without any options, plot.density spreads out nicely, however, naturally, the line I want to add is not plotted since it > is well outside the range automatically determined by plot.density hence the need to add xlim however this produces > something I dont find aesthetically appealing. The plot is squeezed out into a very lean "bell" shape.Using a broken axis is not a good solution to this problem (and there are very few times that using a broken axis is a good idea) It sounds like you are trying to compare a reference value to a distribution. To do this visually they both need to be on the same scale, so that you can see the distance between the reference value and the distribution. Although it may not be aesthetically pleasing, it is true to the data. Hadley
Hadley Your point is valid and well taken. However, the break still shows how far off the value is from the distribution (I intend to add a note to draw a readers attention to this). Anyhow, like I said, I will try the two ideas shared on the list and make a note of what works best for me. Many thanks Ronnie hadley wickham wrote:>> Without any options, plot.density spreads out nicely, however, naturally, the line I want to add is not plotted since it >> is well outside the range automatically determined by plot.density hence the need to add xlim however this produces >> something I dont find aesthetically appealing. The plot is squeezed out into a very lean "bell" shape. > > > Using a broken axis is not a good solution to this problem (and there > are very few times that using a broken axis is a good idea) > > It sounds like you are trying to compare a reference value to a > distribution. To do this visually they both need to be on the same > scale, so that you can see the distance between the reference value > and the distribution. > > Although it may not be aesthetically pleasing, it is true to the data. > > Hadley >
Ronnie Babigumira wrote:> Hi, > Still fresh in R, tried to figure this out, now on my second day running with no luck (and a pile of hair on my desk) so > I have thrown in the towel and would like to ask for some help. > > Here is what I am trying to do. I am trying to plot a distribution, I have 99 points, bound in the range > > xlim.min: -0.0173 > xlim.max: 0.02103 > > However, I have a value outside this range (0.2454959) which I would like to add to the plot as a line and to do this I > use abline(v=0.2454959) > > This is what I write > > >xlim = c(-0.02, 0.3) > >denz <- density(morp) > >plot.density(denz, xlim = xlim, ylim = c(0,70)) > >hist(morp, freq=F, add= T) > >abline(v=0.2454959) > > Without any options, plot.density spreads out nicely, however, naturally, the line I want to add is not plotted since it > is well outside the range automatically determined by plot.density hence the need to add xlim however this produces > something I dont find aesthetically appealing. The plot is squeezed out into a very lean "bell" shape. > > So (finally) my question, how can i widen the spread of my plot and yet also be able to add my xline. >Hi Ronnie, For only one line, it is probably easiest to stick in an axis break and label the line on the x axis. Notice that the position of the line is arbitrarily set to be far enough beyond the end of the density curve to allow room for the axis break. testdata<-rnorm(50,sd=0.01) denz<-density(testdata) plot(denz,xlim=c(-0.02,0.04),axes=FALSE) box() axis(1,at=c(-0.02,0,0.02,0.039),labels=c(-0.02,0,0.02,0.2454959)) abline(v=0.039) axis.break(1,breakpos=0.037) This is probably a common enough problem for inclusion in the axis.break example. Jim