On 02/12/2013 2:22 PM, Jacob Wegelin wrote:
I want to put the "plus or minus" symbol into a character variable, so that this can be
turned into a factor and be displayed in the "strip" of a faceted ggplot2 plot.
A very nice solution, thanks to Professor Ripley's post of Nov 16, 2008;
3:13pm, visible at
http://r.789695.n4.nabble.com/Symbols-to-use-in-text-td874239.html and
subsequently http://www.fileformat.info/info/unicode/char/00b1/index.htm, is:
junk<- "\u00B1"
print(junk)
# This works very nicely. For instance:
junk<-data.frame(gug=c(
rep( "\u00B1 1.2", 10)
,
rep( "\u00B1 2.3", 10)
)
)
junk$eks<-1:nrow(junk)
junk$why<-with(junk, as.numeric(gug) + eks)
print(summary(junk))
library(ggplot2)
print(
ggplot(data=junk, mapping=aes(x=eks, y=why))
+ geom_point()
+ facet_grid(. ~ gug)
)
This works very nicely on my system, but I just wanted to enquire:
Is this machine-independent and stable?
It is machine-independent and stable because \u00B1 means "Unicode
PLUS-MINUS SIGN", but it is not device-independent. There may be a
graphics device that does not support all Unicode characters. I'd
guess it is pretty widely available though.
Is there a "native R" way to do this?
That is native R.
Duncan Murdoch
I did this in:
> sessionInfo()
R version 2.15.3 (2013-03-01)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] ggplot2_0.9.3.1
loaded via a namespace (and not attached):
[1] colorspace_1.2-0 dichromat_1.2-4 digest_0.6.0 grid_2.15.3
gtable_0.1.2 labeling_0.1
[7] MASS_7.3-23 munsell_0.4 plyr_1.8 proto_0.3-10
psych_1.2.8 RColorBrewer_1.0-5
[13] reshape2_1.2.2 scales_0.2.3 stringr_0.6.2
>
Incidentally (and for the sake of keyword searches): Although a google search
initially led me to posts about expression() and plotmath, those eventually had
nothing to do with the solution.
Jacob A. Wegelin
Assistant Professor
Department of Biostatistics
Virginia Commonwealth University
830 E. Main St., Seventh Floor
P. O. Box 980032
Richmond VA 23298-0032
U.S.A.
CTSA grant: UL1TR000058
URL: http://www.people.vcu.edu/~jwegelin
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