Frank,
As you probably realize, the problem is not with lattice but with
unique (actually: .Internal(unique, ...)):
unique(expression('a','b','b'))
generates your error.
Lattice needs a factor variable for the panels, and it tries to
use unique() on your 'vn' to do that.
For example, if you
Whoops - these 2 lines should have been omitted from the program:
n <- sprintf('%s (n%s=%g, n%s=%g)', v, nam[1],n[1], nam[2],n[2])
vn[var == v] <- n
Frank Harrell wrote
> I would like to have a lattice conditioning ( | var ) variable have
> expression() as values because I want panel lab
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