Hello,

I'm not a lattice user but the 'by' argument is not an argument of xyplot, it's an argument of ?seq.Date.


Hope this helps,

Rui Barradas

Em 17-10-2016 15:45, Rich Shepard escreveu:
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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