labelling barplot
On Sat, 2004-11-27 at 08:59 +0000, Ross Clement wrote:
Hi. I'd like to produce a barplot where only the lowest value and the highest value are labelled on the x-axis. E.g. I might have a list of numbers and frequencies: barplot( c( 2, 2, 0, 4, 2 ), names.arg=c( 1, 2, 3, 4, 5 ) ) where the data is a set of counts for some values between 1 and 5. I'd like to have a barplot where only the extremes 1 and 5 are labelled. How do I do this? Thanks in anticipation, Ross Clement
Draw your barplot, saving the bar midpoints in 'mp': mp <- barplot( c( 2, 2, 0, 4, 2 )) Now using axis(), label the x axis. Set 'at' to be the first and last values in the 'mp' vector: axis(1, labels = c(1, 5), at = c(mp[1], mp[length(mp)])) Another alternative is to use mtext() instead of axis() like this: mtext(side = 1, text = c(1, 5), at = c(mp[1], mp[length(mp)]), line = 1) HTH, Marc Schwartz