How to suppress plotting for "xyplot(zoo(x))"?
On Tue, Dec 21, 2010 at 8:40 AM, Gabor Grothendieck
<ggrothendieck at gmail.com> wrote:
On Tue, Dec 21, 2010 at 7:53 AM, Marius Hofert <m_hofert at 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