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

[Jay]

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!