Hi
xiang li wrote:
Also, I am wondering if there is any source where the expressions of many symbols are collected.
Thanks you very much!!!
(Assuming you mean draw the angstrom symbol on a plot ...)
There are several ways:
(i) Specify the character code in octal. Assuming ISO Latin 1 encoding, something like ...
plot(1, type="n")
text(1, 1, "\305")
... or ...
grid.newpage()
grid.text("\305")
... should work. That should be ok on default setups for Windows and Unix. On the Mac it might have to be "\201" (untested) See, e.g., http://czyborra.com/charsets/iso8859.html#ISO-8859-1 (Unix)
http://www.microsoft.com/typography/unicode/1252.gif (Windows)
http://kodeks.uni-bamberg.de/Computer/CodePages/MacStd.htm (Mac)
for other standard "symbols".
(ii) Use a mathematical expression. This won't look as good because the ring and the A are not a single coherent glyph, but it should work "everywhere" ...
plot(1, type="n")
text(1, 1, expression(ring(A)))
... or ...
grid.newpage()
grid.text(expression(ring(A)))
... demo(plotmath) shows the range of things you can do with this approach.
(iii) Use a hershey font (again, should work on all platforms and encodings) ...
plot(1, type="n")
text(1, 1, "\\oA", vfont=c("sans serif", "plain"))
... or ...
grid.newpage()
grid.text("\\oA", gp=gpar(fontfamily="HersheySans"))
... demo(Hershey) shows the symbols available with this approach.
Hope that helps.
Paul -- Dr Paul Murrell Department of Statistics The University of Auckland Private Bag 92019 Auckland New Zealand 64 9 3737599 x85392 [EMAIL PROTECTED] http://www.stat.auckland.ac.nz/~paul/
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