Label the bars on a barplot

Displays labels on a plot, usually a bar plot.

Usage

barlabels(xpos,ypos,labels=NULL,cex=1,prop=0.5,miny=0,offset=0,nobox=FALSE,...)

Arguments

xpos: A vector, matrix or data frame of x positions for the labels.
ypos: A vector, matrix or data frame of y values for the labels.
labels: The labels to display. Defaults to the values of ypos.
cex: Relative size of the labels. See text.
prop: The proportion of ypos at which to place the labels. Defaults to 0.5 (the middle).
miny: The minimum value at which to display labels.
offset: Amount to horizontally offset successive labels in case of vertical overlaps.
nobox: Whether to call boxed.labels or text.
...: Extra arguments passed to boxed.labels or text.

Details

barlabels places labels on a plot at horizontal positions xpos and vertical positions ypos * prop. The typical use of this function is to place labels on bars, by default in the middle of the bars.

To put labels just over the tops of the bars, set prop to 1 and add a constant amount to ypos.

Value

nil

Author

Jim Lemon

Examples

 heights<-c(14,20,9,31,17)
 barpos<-barplot(heights,main="A redundant bar plot")
 # show the usual value labels on the bars
 barlabels(barpos,heights)

 # now with stacked bars and offsets
 heights<-matrix(sample(c(1,2,10,15),20,TRUE),ncol=4)
 barpos<-barplot(heights,main="A redundant stacked bar plot")
 barlabels(barpos,heights,offset=0.1)

 # do it again without stacking
 barpos<-barplot(heights,main="An unstacked redundant bar plot",
  beside=TRUE)
 barlabels(barpos,heights)

 # finally use barp for the plot
 barpos<-barp(heights,main="A fourth and final bar plot",col=2:6,
  names.arg=paste("Day",1:4))
 barlabels(barpos$x,barpos$y,matrix(LETTERS[1:5],nrow=5,ncol=4))