On Oct 26, 2010, at 11:15 AM, Gavin Simpson wrote:
On Fri, 2010-10-22 at 15:39 +0200, Claudia Beleites wrote:
On 10/22/2010 03:15 PM, DrCJones wrote:
<snip />
Being a chemist, it seemed natural to me to put the i after the
concentration
brackets into a subscript - though you didn't say you want that.
A more "correct" expression would be:
group ("[", Ca^'2+', "]") [i]~onsets
You don't need to quote the 2+, but if you don't quote it you have to
give R's parser something to work with on the RHS of "+". phantom() is
useful in such cases:
plot(1:10, ylab = expression(group("[", Ca^{2+phantom()}, "]")
[i]~onsets))
for example, produces similar output to your version. My preference is
to use fewer strings in these expressions, but then again my version
involves more typing. You pays your money... as they say.
You could use doubled single quotes '' in the same position as that
phantom(). Of course that mean means the net effect is just moving
quotes around and probably not in the most intuitive manner.
--
David.
G
where you can easier see that the "[" and "]" are special left and
right
delimiters. Note that the only term that needs to be "hidden" as
character is
the charge, as R doesn't know this way of writing ion charges and
supposes + to
be an infix operator.
Cheers,
Claudia
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Dr. Gavin Simpson [t] +44 (0)20 7679 0522
ECRC, UCL Geography, [f] +44 (0)20 7679 0565
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