Duncan,
Thanks for the suggestion, but that won't work for my situation. I'm trying
to use a character vector to label some axis ticks. There are some elements
in the vector that have either a comma, or both Greek symbols and a comma,
like the the third and fourth elements in x.lab below:
> x <- 1:4
> x.lab <- c("a*a", "bbb", "c,cc*c", "d,dd")
> x.lab <- gsub("\\*", "*Delta*", x.lab)
> x.lab <- parse(text = x.lab)
Error in parse(text = x.lab) : <text>:3:2: unexpected ','
2: bbb
3: c,
^
> dotchart(x, labels = x.lab)
The root problem that I'm stumped on is how to either:
1) insert a comma into an expression and have it be read as a valid
character, or
2) replace the comma in the character string with 'list(a, b, c)' as in the
help for plotmath and have it interpreted correctly.
Cheers,
eric
On Sat, Jul 6, 2013 at 3:33 PM, Duncan Mackay <mac...@northnet.com.au>wrote:
> Hi Eric
>
> I have not been following the thread but following on what David has said
> on previous occasions
>
> try for example
>
> plot(1,1, ylab = expression("aa aaa,aa bb"*Delta*"b cccc"*Delta*"cc, c") )
>
> Below is from a partly saved previous post of David's several months ago
> which may give you some ideas
>
> DATA_names<-c(
> "A mg kg",
> "B mg kg",
> "C mg kg",
> "D mg kg",
> "E mg kg",
> "F mg kg",
> "G mg kg",
> "H mg kg")
>
> pos <- barplot(1:length(DATA_names))
> text(x=pos,y=-1, xpd=TRUE, srt=45,
> labels= sapply( gsub("mg kg", "(mg kg)^-1", DATA_names),
> as.expression))
>
> HTH
>
> Duncan
>
>
> Duncan Mackay
> Department of Agronomy and Soil Science
> University of New England
> Armidale NSW 2351
> Email: home: mac...@northnet.com.au
>
>
>
>
> At 07:47 6/07/2013, you wrote:
>
>> I'm trying to format a given character vector as an expression with Greek
>> symbols to be used in labeling axis ticks. Thanks to some help from David
>> Winsemius, I've learned how to make the substitution and place the Greek
>> symbols in, however I've run into another problem: Some of my labels have
>> commas in them, so when the parse command is executed, there is an
>> unexpected symbol error. For example:
>>
>> > x <- c("aa", "aaa,aa", "bb*Delta*b", "cccc*Delta*cc,c")
>> > parse(text = x)
>> Error in parse(text = x) : <text>:2:4: unexpected ','
>> 1: aa
>> 2: aaa,
>> ^
>>
>> I've tried various iterations of wrapping the commas in interior quotes
>> ("aaa\",\"aa"), but then the error shifts to the quote. I see in plotmath
>> that 'list(a,b,c)' gives me comma separated values, but I haven't been
>> able
>> to work out how to get this construction for elements that have a comma.
>>
>> Is this possible?
>>
>> --
>>
>> Eric Archer, Ph.D.
>> Southwest Fisheries Science Center
>> NMFS, NOAA
>> 8901 La Jolla Shores Drive
>> La Jolla, CA 92037 USA
>> 858-546-7121 (work)
>> 858-546-7003 (FAX)
>>
>> Marine Mammal Genetics Group: swfsc.noaa.gov/prd-mmgenetics
>> ETP Cetacean Assessment Program: swfsc.noaa.gov/prd-etp
>>
>> "The universe doesn't care what you believe.
>> The wonderful thing about science is that it
>> doesn't ask for your faith, it just asks
>> for your eyes." - Randall Munroe
>>
>> "Lighthouses are more helpful than churches."
>> - Benjamin Franklin
>>
>> "...but I'll take a GPS over either one."
>> - John C. "Craig" George
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________**________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help>
>> PLEASE do read the posting guide http://www.R-project.org/**
>> posting-guide.html <http://www.R-project.org/posting-guide.html>
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
--
Eric Archer, Ph.D.
Southwest Fisheries Science Center
NMFS, NOAA
8901 La Jolla Shores Drive
La Jolla, CA 92037 USA
858-546-7121 (work)
858-546-7003 (FAX)
Marine Mammal Genetics Group: swfsc.noaa.gov/prd-mmgenetics
ETP Cetacean Assessment Program: swfsc.noaa.gov/prd-etp
"The universe doesn't care what you believe.
The wonderful thing about science is that it
doesn't ask for your faith, it just asks
for your eyes." - Randall Munroe
"Lighthouses are more helpful than churches."
- Benjamin Franklin
"...but I'll take a GPS over either one."
- John C. "Craig" George
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
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and provide commented, minimal, self-contained, reproducible code.
