On Fri, 14 Oct 2016, David Winsemius wrote:
xyplot(amount ~ date | station, data=rain, main="Weather Stations",
xlab="Date", ylab="Amount (inches)", pch=16, col=132,
scales=list(y=list(at=0:4),
x=list(at=seq(min(rain$date), max(rain$date), by='week'), rot=90)
)
)
David,
I searched ?xyplot for the 'by' option in scales and did not find it. I
understand the other parameters of scales and would like to learn how to use
'by' when appropriate.
TIA,
Rich
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