ggplot2: annotated horizontal lines
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 -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
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_____________________________ Baptiste Augui? 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.