[R] Adding lines to complex xyplot

Duncan Mackay dulcalma at bigpond.com
Wed Feb 26 00:28:23 CET 2014


Once you want to do extra things from the basic you may have to go into the
panel function

            col = c(1,2,3),
            panel = function(x,y,...){
                              panel.abline(a = 0, b=1) 

For more information see
As you have groups the xyplot arguments may be 

panel = panel.superpose,
panel.groups = function(x,y,...){ 

You may also be interested in functions in library(latticeExtra) especially
useOuterStrips which avoids double strips by placing the second as a

As you have not provided a data set then the information is less



Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mackay at northnet.com.au

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Lib Gray
Sent: Wednesday, 26 February 2014 05:34
To: R help
Subject: [R] Adding lines to complex xyplot


I am branching out to xyplot for the first time, and I want to layer
several "complex" xyplots. I have tried using panel functions, but so far I
lose all complexity from the scatterplot. I would like to have the
following things in the plot:

1) A plot of observation vs. modeled individual prediction, by treatment
arm, with each subjects' points connected by lines.


2) Over the former, I would like to add loess smoothers.

I am able to do this in the former with "type=c("b","smooth"), but I would
like to differentiate the smoothers from the rest of the plot with thicker
line widths, and possibly colors.

3) Also over the former, I would like to add a simple abline(0,1).

I can add this, but not also the loess and treatment arm differences with
"panel=function(x,y){}, but cannot figure out to keep all the former

Basically, I am trying to recreated the four basic diagnostic plots from
"xpose4", but adding color for treatment differences.

Any help would be appreciated!

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