[R] graphic device MetaPost

[=?gb2312?q?Jinsong=20Zhao?=]

Hi all,

By default, MetaPost passes all text through TeX. This has the
advantage of allowing essentially any TeX symbols in titles and labels.
It give us, who use the multibyte character in ordinary communication,
much convenience. Gnuplot has fulfilled this function, and it give me a
deep impression for I could use Chinese character in plots with a minor
modification to the MetaPost file.

I hope the R Development Core Team could consider MetaPost as a graphic
device in future R version.

Best wishes,

Jinsong Zhao
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