On 05/04/11 13:14, David Winsemius wrote:
On Apr 4, 2011, at 9:03 PM, David Winsemius wrote:
On Apr 4, 2011, at 8:42 PM, David Scott wrote:
On 05/04/11 05:58, David Winsemius wrote:
On Apr 4, 2011, at 1:27 PM, Marius Hofert wrote:
Dear David,
do you know how to get plotmath-like symbols in both rows?
I tried s.th. like:
lab<- expression(paste(alpha==1, ", ", beta==2, sep=""))
xlab<- substitute(expression( atop(lab==lab., bold(foo)) ),
list(lab.=lab))
xyplot(0 ~ 0, xlab = xlab)
I _did_ have plotmath functions in both rows: But here is your
solution:
xyplot(0 ~ 0, xlab =
expression( atop(paste(alpha==1, " ", beta==2), bold(bla) )) )
)
Note that `paste` in plotmath is different than `paste` in regular
R.
It has no `sep` argument. I did try both substitute and bquote on
you
externally expression, but lattice seems to be doing some non-
standard evaluation and I never got it to "work". Using what I
thought
_should_ work, does work with `plot`:
x=1;y=2
plot(0 ~ 0, xlab = bquote( atop(alpha==.(x)*","~beta==.(y),
bold(foo) ) )
+ )
But the same expression throws an error with xyplot:
x=1;y=2
xyplot(0 ~ 0, xlab = bquote( atop(alpha==.(x)*","~beta==.(y),
bold(foo) ) )
+ )
Error in trellis.skeleton(formula = 0 ~ 0, cond = list(1L), aspect =
"fill", :
could not find function "atop"
I am not sure where I read it and I can't find it again, but my
understanding is that expressions using bquote with lattice need to
be enclosed in as.expression() to work. That is in contrast to what
happens in base graphics.
Perhaps here:
http://finzi.psych.upenn.edu/Rhelp10/2010-August/250832.html
I am pretty sure that was where I saw it. I knew it was out there somewhere.
Or here:
http://finzi.psych.upenn.edu/Rhelp10/2009-July/203714.html
Although I disagree with Heimstra that reading the help(bquote)
provides "more details" that might shed light on why this is so.
David Scott
--
_________________________________________________________________
David Scott Department of Statistics
The University of Auckland, PB 92019
Auckland 1142, NEW ZEALAND
Phone: +64 9 923 5055, or +64 9 373 7599 ext 85055
Email: d.sc...@auckland.ac.nz, Fax: +64 9 373 7018
Director of Consulting, Department of Statistics
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