See this message and the replies to it (and the replies to the replies, etc.):
http://tolstoy.newcastle.edu.au/R/e2/help/07/08/22858.html
In there is a discussion of why you don't really want to do that along with
better alternatives and examples of the improved plots.
--
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 Antonio Olinto
> Sent: Friday, September 10, 2010 8:59 AM
> To: R-help
> Subject: [R] adding labels above bars in a barplot
>
> Hello,
>
> I want to make a general routine to draw barplots with numbers plotted
> above each bar. See the example below.
>
> I could not place the numbers on the middle of each bar because I
> could not calculate the right position of each x-axis tick. axTicks(1)
> indicated a unitary step, but it does not seem work.
>
> I appreciate any help or suggestions.
>
> Best regards,
>
> Antonio Olinto
>
> =====================>
> CAT VAR1 VAR2
> Category 01 17.5 9
> Category 02 15.2 20
> Category 03 10.3 500
> Category 04 8.4 150
> Category 05 20.3 5000
>
> # Coping data from a spreadsheet
>
> dat.data <- read.delim("clipboard",header=T)
>
> summary(dat.data)
> CAT VAR1 VAR2
> Category 01:1 Min. : 8.40 Min. : 9
> Category 02:1 1st Qu.:10.30 1st Qu.: 20
> Category 03:1 Median :15.20 Median : 150
> Category 04:1 Mean :14.34 Mean :1136
> Category 05:1 3rd Qu.:17.50 3rd Qu.: 500
> Max. :20.30 Max. :5000
>
> dat.bar <- data.frame(dat.data[,c(2)])
> row.names(dat.bar)<-dat.data[,1]
> names(dat.bar)<-c("VAR1")
> dat.bar
> VAR1
> Category 01 17.5
> Category 02 15.2
> Category 03 10.3
> Category 04 8.4
> Category 05 20.3
>
> par(mar=c(12,6,3,2),cex.axis=1.2,cex.lab=1.4)
> barplot(t(as.matrix(dat.bar)),ylim=c(0,max(dat.data[,2]*1.1)),las=2,yla
> b="Y
> label text",col="orange")
> box()
>
> up <- max(dat.data$VAR1)*0.1
>
> for (i in c(0:nrow(dat.data))) {
>
legend(0.25+i,dat.bar[1+i,1]+up,dat.data[i+1,3],col="blue",bty="n")
> }
>
>
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