On Tue, Dec 21, 2010 at 8:40 AM, Gabor Grothendieck <ggrothendi...@gmail.com> wrote: > On Tue, Dec 21, 2010 at 7:53 AM, Marius Hofert <m_hof...@web.de> wrote: >> Hi, >> >> I found the thread >> http://r.789695.n4.nabble.com/Matrix-as-input-to-xyplot-lattice-proper-extended-formula-syntax-td896948.html >> I used Gabor's approach and then tried to assign the plot to a variable (see >> below). But a Quartz device is opened... why? I don't want to have anything >> plot/printed, I just would like to store the plot object. Is there something >> like "plot = FALSE"? >> >> Cheers, >> >> Marius >> >> library(lattice) >> library(zoo) >> >> df <- data.frame(y = matrix(rnorm(24), nrow = 6), x = 1:6) >> xyplot(zoo(df[1:4], df$x), type = "p") >> >> plot.object <- xyplot(zoo(df[1:4], df$x), type = "p") # problem: a Quartz >> device is opened (on Mac OS X 10.6) > > This also opens up a window on Windows. It occurs within lattice > when lattice issues a trellis.par.get . A workaround would be to open > a device directed to null. On Windows this would work. I assume if > you use "/dev/null" it would work on your machine. > > png("NUL") > plot.object <- ... > dev.off()
Also Yihui Xie found an undocumented NULL device which you could try See: http://yihui.name/en/2010/12/a-special-graphics-device-in-r-the-null-device/ -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.