[R] barchart but with boxes

[ONKELINX, Thierry]

Dear Daisy,

This is easy woth ggplot2. Use geom_crossbar() and set the middle bar at
the minimum of maximum.

library(ggplot2)
dataset <- data.frame(catg = (c(1,2,3,2,4,3,2,1,4,3,1)), 
min = (c(1,2,3,3,4,5,6,6,3,2,1)), 
max = (c(10,6,8,6,7,3,10,9,10,8,9)))
ggplot(dataset, aes(x = catg, y = min, ymin = min, ymax = max)) +
geom_crossbar(fill = "red", alpha = 0.2, fatten = 1)

HTH,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen
Belgium

Research Institute for Nature and Forest
team Biometrics & Quality Assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium

tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be
www.inbo.be

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than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

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ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey
  

> -----Oorspronkelijk bericht-----
> Van: r-help-bounces op r-project.org 
> [mailto:r-help-bounces op r-project.org] Namens Jim Lemon
> Verzonden: maandag 7 juni 2010 13:27
> Aan: Daisy Englert Duursma
> CC: r-help op r-project.org
> Onderwerp: Re: [R] barchart but with boxes
> 
> On 06/07/2010 04:53 PM, Daisy Englert Duursma wrote:
> > Hello r-help.
> >
> > I have been working on making a graph and have several 
> solutions but 
> > they are tedious at best.
> >
> > Here is an example dataset:
> >
> > catg<-(c(1,2,3,2,4,3,2,1,4,3,1))
> > min<-(c(1,2,3,3,4,5,6,6,3,2,1))
> > max<-(c(10,6,8,6,7,3,10,9,10,8,9))
> > cbind(min,max,catg)
> >
> > What I want to create is a basically a bar chart,  but I define the 
> > min (min) and max (max) for the bars.
> > These bars are separated into three categories (catg). Within each 
> > category the bars are allowed to overlap. I set the bars to have a 
> > transparent color so that I can see agreement of the  items 
> within a 
> > category based on the darkness of color.
> >
> > One method I came up with, is to use ggplot2 and geom_tile 
> but then I 
> > have to give x,y coordinates for every corner of every box.
> > Considering the size of my real datasets, and not this 
> little example 
> > dataset, this seems annoying.
> >
> > I could even just graph lines with the defined min and max. 
> With that 
> > I could make the lines thick and achieve the effect I am 
> looking for.
> >
> Hi Daisy,
> How about this?
> 
> offset<-c(-0.1,-0.1,-0.1,0,-0.1,0,0.1,0,0,0.1,0.1)
> plot(0,xlim=c(0.5,4.5),ylim=c(0,10),type="n")
> segments(catg+offset,min,catg+offset,max,lwd=5,col=3)
> 
> You can program a function to calculate the offsets if you 
> want to do lots of these.
> 
> Jim
> 
> ______________________________________________
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> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 

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