[R] persp() and character labels for axis

[Thomas Steiner]

I want to plot dates on the y-axis of a persp() plot.

persp(x=1:30,y=days,y=yields)
axis(2, 1:5, LETTERS[1:5])

does not work. On the mailinglist I found old messages, that said,
that text() does not apply (yet) for 3-d plots. And the same question
( http://www.r-project.org/nocvs/mail/r-help/2002/9009.html ) was not
answered. Perhaps this time? ;)