[R] Conditionally Updating Lattice Plots

[Gabor Grothendieck]

Try this:

library(lattice)

fancy.lm <- function(x, y, fit = TRUE, resid = TRUE){

	model <- lm(y ~ x)

	y.pred <- predict(model) # Compute residuals for plotting
	res.x <- as.vector(rbind(x, x, rep(NA,length(x)))) # NAs induce breaks in line
	res.y <- as.vector(rbind(y, y.pred, rep(NA,length(x)))) # after Fig
5.1 of DAAG (clever!)

	plot(xyplot(y ~ x, pch = 20))
	trellis.focus()
	if (fit) panel.abline(model, col = "red")
	if (resid) panel.xyplot(res.x, res.y, col = "lightblue", type = "l")
	trellis.unfocus()

}

x <- jitter(c(1:10), factor = 5)
y <- jitter(c(1:10), factor = 10)
fancy.lm(x, y, fit = TRUE, resid = TRUE)


On Sun, Jul 20, 2008 at 12:44 PM, Bryan Hanson <hanson at depauw.edu> wrote:
> Hi All...
>
> I can¹t seem to find an answer to this in the help pages, archives, or
> Deepayan¹s Lattice Book.
>
> I want to do a Lattice plot, and then update it, possibly more than once,
> depending upon some logical options.  Code below; it produces a second plot
> page when the second update is called, from which I would infer that you
> can't update the update or I'm not calling it correctly.  I have a nagging
> sense too that the "real" way to do this is with a non-standard use of
> panel.superpose but I don't quite see how to do that from available
> examples.
>
> TIF for any suggestions, Bryan
>
>
> ************ Example: a function then, the call to the function
>
> fancy.lm <- function(x, y, fit = TRUE, resid = TRUE){
>
> model <- lm(y ~ x)
>
> y.pred <- predict(model) # Compute residuals for plotting
> res.x <- as.vector(rbind(x, x, rep(NA,length(x)))) # NAs induce breaks in
> line
> res.y <- as.vector(rbind(y, y.pred, rep(NA,length(x)))) # after Fig 5.1 of
> DAAG (clever!)
>
> p <- xyplot(y ~ x, pch = 20,
>    panel = function(...) {
>        panel.xyplot(...) # not strictly necessary if I understand correctly
>        })
>
> plot(p, more = TRUE)
>
> if (fit) {
>    plot(update(p, more = TRUE,
>    panel = function(...){
>        panel.xyplot(...)
>        panel.abline(model, col = "red")
>    }))}
>
> if (resid) {
>    plot(update(p, more = TRUE,
>    panel = function(...){
>        panel.xyplot(res.x, res.y, col = "lightblue", type = "l")
>    }))}
>
> }
>
> x <- jitter(c(1:10), factor = 5)
> y <- jitter(c(1:10), factor = 10)
> fancy.lm(x, y, fit = TRUE, resid = TRUE)
>
>
> ************ Session Info
>> sessionInfo()
> R version 2.7.1 (2008-06-23)
> i386-apple-darwin8.10.1
>
> locale:
> en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
>
> attached base packages:
> [1] datasets  grid      grDevices graphics  stats     utils     methods
> [8] base
>
> other attached packages:
>  [1] fastICA_1.1-9         DescribeDisplay_0.1.3 ggplot_0.4.2
>  [4] RColorBrewer_1.0-2    reshape_0.8.0         MASS_7.2-42
>  [7] pcaPP_1.5             mvtnorm_0.9-0         hints_1.0.1-1
> [10] mvoutlier_1.3         robustbase_0.2-8      lattice_0.17-8
> [13] rggobi_2.1.9          RGtk2_2.12.5-3
>
> loaded via a namespace (and not attached):
> [1] tools_2.7.1
>
>
>
>
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