ordinate axe in geom_density

[Gr Hasan]

hello every one,

in the plot function i have:

n= 500

x = rnorm(n)

dx = density(x)

dx$y = dx$y * n

plot(dx)

this instructions change the ordinate axe values from graphe one to the graphe two as you can see in the attached file

my question is if we can do that with ggplot2, my ggplot code is:

ggplot(dataKey,aes(PTIME_ACTUAL)) + geom_density(aes(color=STATION, fill= STATION), alpha= 0.5)

thanks for your aide

regards

[Vivek Patil]

In the case of simulated data, you could potentially do it this way. I am not sure how your specific data are though.

# Base R versions

n= 500

set.seed(123)

x = rnorm(n)

dx = density(x)

plot(dx)

dx$y = dx$y * n

plot(dx)

### ggplot2 versions

n= 500

set.seed(123)

x = rnorm(n)

dx = density(x)

x=dx$x

y=dx$y

df=data.frame(x,y)

ggplot(df,aes(x=x,y=y))+geom_line()

ggplot(df,aes(x=x,y=y*n))+geom_line()+labs(y="y")

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[Dennis Murphy]

Hi:

Here's a way to plot your toy example using count as the y-axis rather
than density:

DF <- data.frame(x = rnorm(500))

library(ggplot2)
ggplot(DF, aes(x = x)) + geom_density(aes(y = ..count..), fill = "darkorange",
color = "darkorange", alpha = 0.5)

If you're plotting multiple densities in one graphics region, here's a
similar toy example:

DF2 <- data.frame(x1 = rnorm(500), x2 = rnorm(500, 1, 0.5))
library(reshape2)
DF2m <- melt(DF2)

ggplot(DF2m, aes(x = value, fill = variable)) +
geom_density(aes(y = ..count..), alpha = 0.5, color = NA)

To see why I used color = NA, try

ggplot(DF2m, aes(x = value, fill = variable, color = variable)) +
geom_density(aes(y = ..count..), alpha = 0.5)


Dennis

On Tue, Jan 7, 2014 at 7:18 AM, Gr Hasan <ghat...@gmail.com> wrote:

[Gr Hasan]

Hello every one,

it works very well, thanks for all of you, and for this wonderful group

regards

Alex

2014/1/7 Dennis Murphy <djm...@gmail.com>