[R] lattice: add vertical lines in xyplot

[hadley wickham]

> Alternatively, I tried in ggplot but here again, I get an error:
>
>> p <- ggplot(my.df, aes(x, y)) +
>>        geom_path(aes(colour = fact)) +
>>                facet_grid(fact2 ~ fact) +
>>                 geom_vline(intercept = my.lines) # how do I select the
>> relevant one ?

If you want a different line in each panel, you'll need to construct a
data frame - see the example at
http://had.co.nz/ggplot2/geom_abline.html for the basic idea.

Hadley


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