Dear List,
I'm trying to typeset some chemical ions in axis labels. These have both
super and subscript components, and for some, I need a superscript "-".
In LaTeX I might use $NO_3^-$ to do the typesetting, but I'm having a
problem getting the correct invocation for expression:
> expression(NO^{-}[3])
Error: syntax error, unexpected '}' in "expression(NO^{-}"
> expression(NO^-[3])
Error: syntax error, unexpected '[' in "expression(NO^-["
> expression(NO^-)
Error: syntax error, unexpected ')' in "expression(NO^-)"
> expression(NO^{-})
Error: syntax error, unexpected '}' in "expression(NO^{-}"
This is with R 2.5.1 (exact version info below).
I suspect this is something to do with my use of the "-", which has some
special meaning.
Is there a way to achieve a superscript "-" (or similar looking
character) using the plotmath routines in R?
Thanks in advance,
G
> version
_
platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status Patched
major 2
minor 5.1
year 2007
month 07
day 05
svn rev 42131
language R
version.string R version 2.5.1 Patched (2007-07-05 r42131)
--
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Gavin Simpson [t] +44 (0)20 7679 0522
ECRC, UCL Geography, [f] +44 (0)20 7679 0565
Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk
Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/
UK. WC1E 6BT. [w] http://www.freshwaters.org.uk
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