geom_density as a line (not a closed polygon)?

[Mike Lawrence]

Currently geom_density creates a closed polygon (plotted in red
below); is there any way to make it a single line as in the normal
density function (plotted in green below)?

a = data.frame(obs = test_data,condition = 'None')
p = ggplot(
data = a
,aes(
x = obs
)
)+geom_histogram(
aes(
y = ..density..
)
)+geom_density(
colour='red'
)+stat_function(
fun = dnorm
,args = list(
m=mean(a$obs)
,sd=sd(a$obs)
)
,colour = 'green'
)

--
Mike Lawrence
Graduate Student
Department of Psychology
Dalhousie University

Looking to arrange a meeting? Check my public calendar:
http://tinyurl.com/mikes-public-calendar

~ Certainty is folly... I think. ~

[baptiste auguie]

Hi,

it seems you can do the following,

m <- ggplot(movies, aes(x=rating))
m + stat_density(mapping=aes(ymax=1),geom="path")

I'm not quite sure about the meaning of ymax though.

Alternatively you could overwrite the bottom line with an horizontal
line of the same colour as the grid and axes (this way you can still
use a fill colour).


HTH,

baptiste

--

_____________________________

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
______________________________

[Mike Lawrence]

setting ymax to max(..density..) seems to work well:

m <- ggplot(movies, aes(x=rating))
m + stat_density(mapping=aes(ymax=max(..density..)),geom="path")

[hadley wickham]

The error message is a better guide to what the real problem is -
stat_density defaults to position stack which doesn't make sense for
lines. This is a better alternative:

m + stat_density(geom="path", position="identity")

Hadley

--
http://had.co.nz/