[R] lattice: how to add points to the plot generated bylevelplot()?

[Bert Gunter]

Tip 1: This sort of thing is done with panel functions. ?xyplot and
?panel.xyplot is where to start.

Tip 2: grid functions are generally not necessary, as translations of the
common ones are part of lattice. See ?panel.points

Tip 3: Deepayan's book provides a gentler explanation of these matters with
more examples than R's man pages.

Tip 4: Depending on your needs and predilections, you may prefer to use
ggplot2.

Bert Gunter
Genentech Nonclinical Biostatistics
 
 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Erik Iverson
Sent: Wednesday, March 31, 2010 12:54 PM
To: Czerminski, Ryszard
Cc: R-help at r-project.org
Subject: Re: [R] lattice: how to add points to the plot generated
bylevelplot()?



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.

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