[R] histogram plots with many different samples

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Wed Mar 25 16:09:44 CET 2009

Dear Evrim,

That is easy to do with the ggplot2 package. You only need the data in a
"long" format. melt() is very usefull to convert data from a wide to a
long format.

n <- 100
Wide <- data.frame(X1 = rnorm(n, mean = -0.5), X2 = rnorm(n, mean = 0,
sd = 2), X3 = rnorm(n, mean = 0.5))
Long <- melt(Wide)
ggplot(Long, aes(x = value, fill = variable)) + geom_histogram(position
= position_dodge())
#some alternatives
ggplot(Long, aes(x = value, fill = variable)) + geom_histogram()
ggplot(Long, aes(x = value)) + geom_histogram() + facet_wrap(~ variable)
ggplot(Long, aes(x = value)) + geom_histogram() + facet_grid(variable ~



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
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens evrim akar
Verzonden: woensdag 25 maart 2009 15:40
Aan: r-help at r-project.org
Onderwerp: [R] histogram plots with many different samples

Dear R users,

I would like to draw some histograms as seen in the page whose address I
wrote below. I searched through the web a lot and I found a page which
describes how I can do it for older versions of R. For newer versions
recommend to install the package R.basics in R.clusters but this does
exist. The address of the web page is

Unfortunately I could not find any other resource or help. Is it
possible to
make histograms like I wanted with R? If so, could you please give any
advise on how I can do it?

Thank you,



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