Bill,
Thanks so much for the tips. For the project that I'm doing now, I don't
need to worry about bullet-proofing it too much, but this is definitely
educational and will help tons when the next one comes around.
Cheers,
eric
On Sun, Jul 7, 2013 at 10:22 AM, William Dunlap <wdun...@tibco.com> wrote:
> > x.lab <- gsub(",","*symbol(\"\\\\54\")*", x.lab)
>
> Wouldn't using just
> "*\",\"*"
> instead of
> "*symbol(\"\\\\54\")*"
> as the replacement do the same thing?
> To me it is simpler to understand.
>
> Note that this fails if the comma is the first or last
> character in the input because '*something*' is
> not a valid expression. Another problem is that '**'
> is parsed the same as "^", so "a**d" is displayed as
> "a Delta superscript Delta d". One way to deal with that
> problem is to strip possible '*'s from the ends of
> x.lab and convert '**'s to '*'s before giving it to the parser.
> x.lab <- gsub("^\\*|\\*$", "", x.lab)
> x.lab <- gsub("\\*\\*", "*", x.lab)
> as in
> f1 <- function (x.lab)
> {
> x.lab <- gsub("\\*", "*Delta*", x.lab)
> x.lab <- gsub(",", "*\",\"*", x.lab)
> x.lab <- gsub("^\\*|\\*$", "", x.lab)
> x.lab <- gsub("\\*\\*", "*", x.lab)
> parse(text = x.lab, keep.source = FALSE)
> }
> where the code in your mail corresponds to the function f0:
> f0 <- function (x.lab)
> {
> x.lab <- gsub("\\*", "*Delta*", x.lab)
> x.lab <- gsub(",", "*symbol(\"\\\\54\")*", x.lab)
> parse(text = x.lab, keep.source = FALSE)
> }
>
> Another approach is not to turn the commas into strings, but
> turn anything that is not a '*' into a string. Then you don't have
> to change your code when you discover that the inputs might
> contain semicolons or something else.
> f2 <- function (x.lab)
> {
> x.lab <- gsub("([^*]+)", " \"\\1\" ", x.lab)
> # I put spaces around things to make it a little more readable;
> # they may not be very readable in some fonts.
> x.lab <- gsub("\\*", " * Delta * ", x.lab)
> x.lab <- gsub("^ \\*|\\* $", "", x.lab)
> x.lab <- gsub("\\* \\*", "*", x.lab)
> parse(text = x.lab, keep.source = FALSE)
> }
>
> Use it as in
> dotchart(1:4, labels=f2(c("***d", ",,c*", "a,*d", "****")))
> This code gets ugly pretty quickly so you should bury it in a function.
>
> Bill Dunlap
> Spotfire, TIBCO Software
> wdunlap tibco.com
>
>
> > -----Original Message-----
> > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
> On Behalf
> > Of Eric Archer - NOAA Federal
> > Sent: Saturday, July 06, 2013 10:55 PM
> > To: Duncan Mackay; r-help-r-project.org
> > Subject: Re: [R] Transferring commas in character vector to expression
> >
> > Duncan,
> >
> > Thanks! That was the tip I needed. With that, I was able to get this to
> > work perfectly:
> >
> > x.lab <- c("a*a", "bbb", "c,cc*c", "d,dd")
> > x.lab <- gsub("\\*", "*Delta*", x.lab)
> > x.lab <- gsub(",", "*symbol(\"\\\\54\")*", x.lab)
> > dotchart(1:length(x.lab), labels = parse(text = x.lab))
> >
> >
> >
> > On Sat, Jul 6, 2013 at 9:38 PM, Duncan Mackay <mac...@northnet.com.au
> >wrote:
> >
> > > Eric
> > >
> > > How does this look - (you might have to add a few symbol("\54") where
> > > needed for me this give a comma on windows7 ver 3.1
> > >
> > > xyplot(1:4 ~ 1:4, scales = list(x=list(at = 1:4, labels =
> > >
> >
> c(expression(a*a),expression(bbb),expression(c*Delta*cc*c),expression(d*Delta*symbol(
> > "\54")*dd)
> > > ) ) ) )
> > >
> > > I mostly use lattice and have forgotten how to do labels in basic plot
> so
> > > have used lattice. should be similar and you can modify to suit.
> > >
> > > It was trial and error in going up through the numbers from about 38
> > >
> > >
> > > Duncan
> > >
> > > At 11:57 7/07/2013, you wrote:
> > >
> > > 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
> > > PLEASE do read the posting guide
> > > 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
> > >
> > >
> >
> >
> > --
> >
> > 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
> > PLEASE do read the posting guide
> 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
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
