From: Bill Dunlap <bill_at_insightful.com>

Date: Fri 17 Nov 2006 - 19:45:15 GMT

setMethod("plot", sig=signature(x="missing", y="missing"),

Bill Dunlap

Insightful Corporation

bill at insightful dot com

360-428-8146

R-devel@r-project.org mailing list

https://stat.ethz.ch/mailman/listinfo/r-devel Received on Sat Nov 18 06:47:52 2006

Date: Fri 17 Nov 2006 - 19:45:15 GMT

Someones you need to set up a plot before the
data is ready to plot. You know the desired
axis limits (xlim and ylim), but don't have
the data all in one vector. You would like to
set up the coordinate system, perhaps draw the
axes and titles, but draw no points. You can do that with

plot(x=xlim, y=ylim, type="n", xlab="", ylab="") In R you could use ann=FALSE instead of xlab="", ylab="". In either you could supply non-null values for xlab and ylab but the default, xlab="xlim", ylab="ylim", would not be desirable. You could supply other scaling-related arguments like log="x".

We could write an method for plot with signature x="missing",y="missing" so the syntax for the above would be a bit more natural

plot(xlim=xlim, ylim=ylim)

If you want non-null xlab or ylab, supply them.
If you don't want axes, supply axes=FALSE, just
as with the usual plot(). Would this be desirable?
(It made things easier to explain to my son.)

The following code does that in either R or Splus:

.plot.noxy <-

function(..., xlim, ylim, xlab = "", ylab = "")
{

stopifnot(length(xlim) == 2, all(is.finite(xlim))) stopifnot(length(ylim) == 2, all(is.finite(ylim))) plot(type = "n", x = xlim, y = ylim, ..., xlim = xlim, ylim = ylim, xlab = xlab, ylab = ylab)}

setMethod("plot", sig=signature(x="missing", y="missing"),

definition=function(x, y, ...).plot.noxy(...))

E.g.,

plot(xlim=c(-2,2), ylim=c(-2,2)) # set up plot and draw axes for(i in -10:10)points( (.8+.7i)^i) # add points to graph

Bill Dunlap

Insightful Corporation

bill at insightful dot com

360-428-8146

"All statements in this message represent the opinions of the author and do not necessarily reflect Insightful Corporation policy or position."

R-devel@r-project.org mailing list

https://stat.ethz.ch/mailman/listinfo/r-devel Received on Sat Nov 18 06:47:52 2006

Archive maintained by Robert King, hosted by
the discipline of
statistics at the
University of Newcastle,
Australia.

Archive generated by hypermail 2.1.8, at Fri 17 Nov 2006 - 21:30:46 GMT.

*
Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-devel.
Please read the posting
guide before posting to the list.
*