That's great - thanks!
On 4 Mar 2009, at 08:59, ONKELINX, Thierry wrote:
Dear Dave,
Another option would be to manually create the breaks of your plot.
library(ggplot2)
myBreaks <- sort(c(pretty(mtcars$mpg), min(mtcars$mpg)))
ggplot(aes(x = wt, y = mpg), data = mtcars) + geom_point() +
geom_hline(yintercept = min(mtcars$mpg)) + scale_y_continuous(breaks
= myBreaks)
HTH,
Thierry
----------------------------------------------------------------------------
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for
Nature and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
thierry.onkel...@inbo.be
www.inbo.be
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more than asking him to perform a post-mortem examination: he may be
able to say what the experiment died of.
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-----Oorspronkelijk bericht-----
Van: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
project.org] Namens baptiste auguie
Verzonden: dinsdag 3 maart 2009 21:50
Aan: Dave Murray-Rust
CC: R Help
Onderwerp: Re: [R] ggplot2: annotated horizontal lines
I see your problem (although label should be outside the mapping in
your case, i think).
A possible workaround is to provide some dummy data, as the default
NULL doesn't seem to work,
qplot( wt, mpg, data=mtcars ) +
geom_text(data=data.frame(x=0,y=0),mapping=aes(x=1,y=0),label="test")
I'm sure Hadley will come up with a better explanation.
Best,
baptiste
On 3 Mar 2009, at 19:51, Dave Murray-Rust wrote:
On 3 Mar 2009, at 18:41, baptiste auguie wrote:
What's wrong with geom_text?
my.value = 0.65
qplot(1,1)+geom_hline(v=0)+
geom_text(mapping=aes(x=1,y=0),label=paste(my.value),vjust=-1)
Well, firstly I hadn't thought to use it. Ooops.
Secondly, I can't make it just do a single value - it seems to want a
value for every point in the dataset, e.g.:
qplot( wt, mpg, data=mtcars ) +
geom_text(mapping=aes(x=1,y=0,label=paste("0.5"),vjust=-1))
Error in data.frame(..., check.names = FALSE) :
arguments imply differing number of rows: 1, 32
Cheers,
dave
baptiste
On 3 Mar 2009, at 18:10, Dave Murray-Rust wrote:
Hello,
I'm using geom_hline to add a minimum line to my plot (representing
the best solution found so far by a search algorithm). I'd like to
annotate this line with it's numerical value to save trying to read
it
off the graph, but I can't see a clear way to do this - any ideas?
(Alternatively, if this is against the spirit of the grammar of
graphics, is there a better way to represent the information?)
Cheers,
dave
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_____________________________
Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag
______________________________
--
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
_____________________________
Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag
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