[R] xyplot: adjusting the scale (min, max & tick)

[Peter Ehlers]

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!
> 
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-- 
Peter Ehlers
University of Calgary
403.202.3921