[R] png() devices

[ripley@stats.ox.ac.uk]

Would you like to contribute a png() device for MacOS?

The thing is, kind users of Windows and of Unix/X11 did contribute one for
each. Perhaps you now appreciate their efforts?

On Tue, 12 Nov 2002, Tom Arnold wrote:

> Another question in my post confused the issue. I mentioned that I'm using
> pdf() and asked what happened to the png() function. Let me try to clarify:
> - I want to produce a separate file for inclusion in web or print documents.
> - In the past I've used the png() function, on Windows to create a file for
> use on a web page
> - I work alternately on Mac, Windows, Linux, and Mac OS X (A FreeBSD
> derivative)
> - I'm working on Mac OS 9.1 at the moment.
>
> I grabbed some old files I'd created with subroutines in R that I used on R
> 1.4.1 on Windows. I opened them on my Mac and tried to run them in R 1.6.1 and
> found that png() does not exist. I didn't think to go back to the Windows
> platform and try it, and I guessed that for some reason png had disappeared --
> much the same as GIF disappeared from some open source packages like GD a few
> years ago because of the Unisys patent claim on LZW compression. Of course I
> had no data for this, it was a guess. It didn't occur to me that a call to
> produce "portable network graphics" would appear only on certain computing
> platforms, [mild irony] and I saw no mention of it in the documentation.
>
> So I looked around and found the pdf() call and started using that. For print
> documents, it will probably work better anyway. Of course the formats were
> created for different needs; that was not my question. I just was surprised
> that png() seemed to have "disappeared" from my Mac version of R, when in fact
> I guess it never existed in that version anyway.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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