Jay wrote:
Perfect, that piece of code did exactly what I wanted. However, I stumpled
upon a new problem, now my data is plotted on a totally wrong scale. The
y-values are all between 160k and 500k, BUT now with that option I find that
the plots are between 0 and 50 (?!?). What did I do wrong?

This plots the data OK, even thoug it should be between  160k and 500k on
the y-scale:

xyplot(data1[,2]+data1[,3]~data1[,1], data = data1,
        type = "l",
        xlab = "x",
        ylab = "y",
        auto.key = list(space="top", lines = T, points = F, text=c("text1",
text2")),
        par.settings = simpleTheme(lty = c(1,2)),
        scales=list(
          x=list(alternating=FALSE,tick.number = 11),
          y=list(limits=c(0,50))
) )
If I remove the " y=list(limits=c(0,50))" the dat is plotted as it should.

You probably want something like

  y = list(at = seq(100, 200, 25), limits = c(100, 200))

Try this:
x <- 1:20
y1 <- rnorm(20)*1e3
y2 <- rnorm(20)*1e3
xyplot(y1 + y2 ~ x, type='l',
  scales = list(y = list(
     at = seq(-300,400,100),
     limits = c(-500,500)))
)

# or, you could use the ylim argument instead of 'limits=':
xyplot(y1 + y2 ~ x, type='l', ylim = c(-500, 500),
  scales = list(y = list(
     at = seq(-300,400,100)))
)

 -Peter Ehlers



Peter Ehlers wrote:
Have a look at the 'scales' argument. For example:

# default plot
xyplot(Sepal.Length ~ Petal.Length | Species, data = iris)

# modified plot
xyplot(Sepal.Length ~ Petal.Length | Species, data = iris,
     scales=list(y=list(at=c(-5,0,5,10), limits=c(-5,10))))

  -Peter Ehlers

Jay wrote:
Hi,

I'm terribly sorry but it seems it cannot figure this one out by
myself so, please, if somebody could help I would be very grateful.
So, when I plot with xyplot() I get an y-axis that is very ugly...
starting from a random number and having so many ticks that it becomes
unreadable.

How do I tell xyplot how to draw the axis? E.g., start from 100, end
at 200 with 25 units between ticks/labels?
Can somebody give me an example?

Thanks!

______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.


--
Peter Ehlers
University of Calgary
403.202.3921

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.




--
Peter Ehlers
University of Calgary
403.202.3921

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

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