[R] Trellis device automatism [was "X11 device now needs ..?"]
maechler at stat.math.ethz.ch
Fri Jan 17 11:27:03 CET 2003
>>>>> "Deepayan" == Deepayan Sarkar <deepayan at stat.wisc.edu>
>>>>> on Thu, 16 Jan 2003 15:20:20 -0600 writes:
Deepayan> On Thursday 16 January 2003 02:10 pm, Patrick Connolly wrote:
>> On Wed, 15-Jan-2003 at 10:47PM -0600, Deepayan Sarkar wrote:
>> |> On Wednesday 15 January 2003 07:35 pm, Patrick Connolly wrote:
R version 1.6.2
>> |> > Until this version, I've not had to explicitly start the x11 device.
>> |> > Now, (at least with lattice plots), one is not automatically started
>> |> Could you explain ? There's sometimes a warning, but I haven't seen
>> |> the device not being opened.
>> On closer inspection, I see that it falls over earlier than the
>> plotting itself. It arises when I attempt to adjust some trellis
>> settings. This is the message:
>> Error in trellis.par.set(y, x) : No device is currently Active
>> I notice that trellis.par.set has been changed this time.
>> "trellis.par.set" <-
>> function (name, value, warn = TRUE)
>> if (!is.list(value))
>> stop("value must be a list")
>> if (warn && is.null(dev.list()))
>> stop("No device is currently Active")
>> lattice.theme[[.Device]][[name]] <<- value
>> Previously, it had been only the last line.
>> The problem arises because dev.list() returns NULL if no device is
>> open and thus the call to stop().
>> I don't know whether it would be a good idea to have trellis.par.set
>> start the default device.
Deepayan> Personally, I don't have any strong preferences,
Deepayan> other than that the old behaviour (which silently
Deepayan> did nothing, if I remember correctly) should be
Deepayan> changed. Maybe we should go with S-PLUS behaviour,
Deepayan> which gives an error if trellis.par.set() is
Deepayan> called without an open device, but DOES start the
Deepayan> default device if trellis.par.get() is
Deepayan> called. This would mean that lset() would also
Deepayan> start the device.
Deepayan> Does that sound OK ?
partially. I would provide this *at least*
Couldn't you even do more automatism, namely, start the default
device even for trellis.par.set().
This would be "compatible" with a non-lattice graphics call of
par("<name>") [ ~= trellis.par.get(.) ] and
par(<name> = ..) [ ~= trellis.par.set(.) ]
Martin Maechler <maechler at stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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