[R] multiple x-axis labels on plot

[Uwe Ligges]

t.d. kaplan wrote:
> hi,
> 
> how can i set multiple x-axis labels on a plot? in effect, i want
> to set 2 x-axis labels and values on the tick marks. is it possible
> to have one running on the bottom (as is the default) and another
> running across the top of a plot?


Yes, for plotting axes separately, see ?axis.
For plotting annotation along the margins of the plot, see ?mtext.

Uwe Ligges

> like:
> 
> xlab-1
> ---------
> |       |
> |       |
> ---------
> xlab-0
> 
> 
> thanks.
> 
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