[Rd] Plot Dates (PR#2737)

[possolo at crd.ge.com]

Full_Name: Antonio Possolo
Version: 1.6.2
OS: Linux & Windows2000
Submission from: (NULL) (192.35.44.3)


x <- as.POSIXct(strptime(c("1993-5-11", "1994-11-23",
                           "1995-7-8", "1996-10-15"), format="%Y-%m-%d"))
y <- c(15, 32, 47, 61)
plot(x, y, xlab="Date", ylab="Count")

Warns "parameter "ylab" couldn't be set in high-level plot() function",
but generates the label as specified.
Without 'ylab="Count"' no warning message is issued.