R help - Mar 2010 - lattice: how to add points to the plot generated by levelplot()?

I am using levelplot() function from pkg:lattice and I want to add some
points
to the plot generated by levelplot()
similarly as in basic R graphic sequence: plot(...); points(...),
but it does not work.

I was reading documentation for lattice, but so far without much
success.

I would very much appreciate some tips.

Best regards,
Ryszard


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Czerminski, Ryszard wrote:
> I am using levelplot() function from pkg:lattice and I want to add some
> points
> to the plot generated by levelplot()
It's best to include a small example of what you have done so far, and 
what you want to further do.  Actual R code with a small sample dataset 
is great.

> similarly as in basic R graphic sequence: plot(...); points(...),
> but it does not work.
> 
> I was reading documentation for lattice, but so far without much
> success.
> 
> I would very much appreciate some tips.

Most base graphics functions like point have a grid equivalent.  In this 
case, use grid.points.

  levelplot(runif(100)~runif(100)*runif(100),
                panel = function(...) {
                  panel.levelplot(...)
                  grid.points(.1, .1, pch = 2)
                  })


I found the Lattice book and the "R Graphics" book invaluable, both
are
worth getting.

You can use

levelplot(runif(100)~rep(1:10, each=10)+rep(1:10, times=10))
trellis.focus("panel", 1, 1, highlight=FALSE)
 lpoints(runif(100,0,10), runif(100,0,10), pch=2, col=2, cex=2)
trellis.unfocus()

# or

levelplot(runif(100)~rep(1:10, each=10)+rep(1:10, times=10),
          panel=function(...){
            panel.levelplot(...)
            grid.points(runif(100,0,10), runif(100,0,10), pch=2)
          }
          ) 

Walmes

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..(....)... 0ooo...                              Walmes Zeviani
...\..(.....(.....)...     Master in Statistics and Agricultural
Experimentation
....\_)..... )../....       walmeszeviani at hotmail.com, Lavras - MG, Brasil
............
(_/............................................................................................
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