[R] format secondary axis for dates

Jannis bt_jannis at yahoo.de
Tue Nov 16 20:32:02 CET 2010

Dear List,

this may be a Newbi question and may have been asked several times, but i am too stupid to find the posts.

I have a plot of values against POSIXct time steps. If I want to add a second x axis to the top margin of the plot, only numbers are at the tickmarks. Is there a straightforward way to specify the format to convert them to character representations (similar to the labels at the bottom)?


Thanks for your help


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