I'm having some trouble using the latticeExtra 'combineLimits' function
with a Date x-variable:

require(lattice)

set.seed(12345)

dates <- seq(as.Date("2011-01-01"), as.Date("2011-12-31"), "days")
dat <- data.frame(d = rep(dates, 4),
                  g = factor(rep(rep(c(1,2), each = length(dates)), 2)),
                  h = factor(rep(c("a", "b"), each = length(dates)*2)),
                  x = rnorm(4 * length(dates)),
                  y = rnorm(4 * length(dates)))

plt1 <- xyplot(x + y ~ d | g, groups = h, data = dat, type = 'l', scales =
list(relation = "free"),
               auto.key = TRUE)
plt1 <- useOuterStrips(plt1)
plt1 <- combineLimits(plt1)

The x-axis labels are right after the call to 'useOuterStrips' but they get
converted to numeric after the call to 'combineLimits'. How do I keep them
as date labels?

Thanks.

- Elliot

-- 
Elliot Joel Bernstein, Ph.D. | Research Associate | FDO Partners, LLC
134 Mount Auburn Street | Cambridge, MA | 02138
Phone: (617) 503-4619 | Email: elliot.bernstein@fdopartners.com

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