[R] labelling barplot

[Ross Clement]

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