[R] Lattice in a loop does not produce output

Bryan Hanson hanson at depauw.edu
Tue Aug 18 14:47:24 CEST 2009


Lattice objects must be assigned and deliberately printed:

> png("test.png")
> p <- xyplot(y~x|z)
> plot(p)
> dev.off()

Should fix both problems.  Bryan
*************
Bryan Hanson
Professor of Chemistry & Biochemistry
DePauw University, Greencastle IN USA




On 8/18/09 8:13 AM, "Alex van der Spek" <amvds at xs4all.nl> wrote:

> I cannot understand why xyplot does not work within a simple for loop.
> 
> This works up to the for loop; inside the for loop the png files are
> opened and closed, but nothing is plotted. No error messages are written
> to the console either. This is the case on both Windows and Linux.
> 
> By the way, running the script below on Linux using source() does not
> even produce the first xyplot. This is less of an issue for me though.
> 
> #! usr/bin/env R
> # Test lattice loop
> 
> rm(list=ls())
> 
> x<-1:16
> y<-2*x-1
> z<-rep(c('A','B','C','D'),4)
> 
> xyz<-data.frame(x=x,y=y,z=z)
> 
> require(lattice)
> 
> png('Test.png')
> xyplot(y~x|z)
> dev.off()
> 
> for (i in 1:5) {
> f<-paste('Test',i,'.png',sep='')
> png(f)
> xyplot(y~x|z)
> dev.off()
> }
> 
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