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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