On Friday 23 April 2004 03:23, Martin Maechler wrote:
> >>>>> "BDR" == Prof Brian Ripley <[EMAIL PROTECTED]>
> >>>>> on Fri, 23 Apr 2004 08:21:34 +0100 (BST) writes:
>
> <........>
>
> BDR> It is a matter for discussion (with the lattice
> BDR> maintainer) whether trellis.device should help you out
> BDR> here by importing the devices from package graphics. I
> BDR> think adding (conditionalized on the platform)
>
> BDR> importFrom(graphics, windows, postscript, pdf, pictex,
> BDR> win.metafile, win.print, png, jpeg, bmp, xfig,
> bitmap)
>
> BDR> to its NAMESPACE might be worth considering.
>
> BDR> Alternatively, device.call <- get(device) could be put
> BDR> in a try call, followed by a try on
> BDR> getFromNamespace("graphics", device).
>
> That's a very good idea, I'd support quite a bit.
>
> I think I would go with the alternative approach
> (where you probably meant to say device <- getOption("device")
> first?),
(yes, device is an argument to trellis.device that defaults to
getOption("device"))
> since the importFrom(..) approach leeds to a somewhat
> tedious maintenance effort to keep up the list of available devices
> for the different platforms (For MacOS X one has to include quartz()
> only in the situations where it's available) where as Deepayan (the
> lattice maintainer) could rely on getOption("device") to be ok
> {and as you proposed would be on guard using try() or its newer
> siblings}.
That sounds like a good argument to go with the second approach. Looks
like I would need importFrom(utils, getFromNamespace) for that, right ?
I'll release an updated version over the weekend.
Deepayan
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