[R] How to get a grid behind a boxplot

[Neuro LeSuperHéros]

Simply add the same boxplot over your first graph using par(new=TRUE)

x <-1:10
y <-1:5
boxplot(x, y,col="blue")
grid(nx=NA, ny=NULL) #grid over boxplot
par(new=TRUE)
boxplot(x, y,col="blue")#grid behind boxplot

Neuro



>From: "Toby Popenfoose" <tpopenfoose at earthlink.net>
>Reply-To: Toby Popenfoose <tpopenfoose at earthlink.net>
>To: <r-help at stat.math.ethz.ch>
>Subject: [R] How to get a grid behind a boxplot
>Date: Fri, 28 Apr 2006 19:46:52 -0400
>
>I am using R 2.2.1 on a Windows 2000 PC.
>When I do a grid() after the boxplot
>it overprints the boxplot:
>
> > boxplot(count ~ spray, data = InsectSprays, col = "lightgray")
> > grid(nx=NA, ny=NULL)
> >
>
>if I try the panel.first
>
> > boxplot(count ~ spray, data = InsectSprays, col = "lightgray",
>+         panel.first=grid(nx=NA, ny=NULL))
> >
>
>I can see the grid flash and go away.
>
>If I close the device and then try the panel.first,
>I do not get a boxplot and the following error message:
>
> > boxplot(count ~ spray, data = InsectSprays, col = "lightgray",
>+         panel.first=grid(nx=NA, ny=NULL))
>Error in abline(h = at, col = col, lty = lty, lwd = lwd) :
>  plot.new has not been called yet
> >
>
>Same thing when I try pdf device:
>
> > pdf("test.pdf")
> > boxplot(count ~ spray, data = InsectSprays, col = "lightgray",
>+         panel.first=grid(nx=NA, ny=NULL))
>Error in abline(h = at, col = col, lty = lty, lwd = lwd) :
>  plot.new has not been called yet
> > dev.off()
>null device
>           1
>
>How can I get the grid behind the boxplot?
>
>Thank you,
>Toby Popenfoose
>Donnelley Manufacturing Supervisor
>tpopenfoose at earthlink.net
>
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