Thank you all, I've got everything I need now.

On Mon, Oct 27, 2008 at 2:29 PM, <Richard.Cotton@hsl.gov.uk> wrote:

> > the example below does not work. (i know it's not supposed, but it makes
> it
> > clear what i'm trying to achieve)
> >
> > par(mfrow=c(2,1))
> > xyplot(y~x2|x1,data=dataframe1,pch=20)
> > xyplot(y~x2|x1,data=dataframe2,pch=20)
> >
> > i know i could probably merge the two datasets and do something like
> > xyplot(y~x2|x1+dataset,data=merged)
>
> par is a base graphics command, and doesn't work with grid/lattice
> graphics.  While it is possible to merge grid and base graphics using for
> example the gridBase package, I suspect what you want is to draw two
> lattice plots on the same figure. For this, you need to read up on
> viewports, and try an example like this:
>
> pushViewport(viewport(layout=grid.layout(2,1)))
> pushViewport(viewport(layout.pos.row=1))
> topplot = xyplot(Sepal.Length ~ Petal.Length | Species, data = iris)
> print(topplot, newpage=FALSE)
> upViewport()
> pushViewport(viewport(layout.pos.row=2))
> bottomplot = xyplot(Sepal.Width ~ Petal.Width | Species, data = iris)
> print(bottomplot, newpage=FALSE)
> popViewport(2)
>
> See also section 5.5 in Paul Murrell's book ('R Graphics').
>
> Regards,
> Richie.
>
> Mathematical Sciences Unit
> HSL
>
>
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