[R] persp() and character labels for axis

[Thomas Steiner]

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

> ?persp points you to ?trans3d which is useful to calculate coordinates
> for calls to 2D functions such as text().

?trans3d gives this:
No documentation for 'trans3d' in specified packages and libraries:
you could try 'help.search("trans3d")'

Even loading grDevices and graphics libraries did not help.
http://finzi.psych.upenn.edu/R/library/grDevices/html/trans3d.html
seems to be what I should look for, but there it says noting about
text either (I want to label axis! ,something like
t=1:10
plot(x=t,y=t^2,type="l")
axis(1,labels=LETTERS[1:5])
and more proper...)

Thomas