Thank you for all the advice! After mailing the question, I actually found a
function called multhist (plotrix package) that plots two data sets (in single
list) on a single histogram.
The script is as follows:
#I listed to two data sets in âlongâ format in a .csv file
input <- read.csv(file= "list.csv", h = TRUE)
library(plotrix)
#to plot two data sets on one histogram
multhist(input, xlab="Labelâ, ylab="Frequency", col=c("Red", "Green"),
ylim=c(0,50))
#to add a legend to the top left corner
legend("topleft", c("Dataset 1","Data set 2"), cex=0.6,bty="n",
fill=c("Red","Green"))
Thanks again for the help!
From: John Kane [mailto:jrkrid...@inbox.com]
Sent: 26 June 2012 23:27
To: ilai
Cc: Blignaut, M, Mej <mb...@sun.ac.za>; r-help@r-project.org
Subject: Re: [R] plotting two histograms on one plot with hist function
Oh, I had not thought of it in those terms. It does make sense now.
John Kane
Kingston ON Canada
-----Original Message-----
From: ke...@math.montana.edu
Sent: Tue, 26 Jun 2012 10:57:31 -0600
To: jrkrid...@inbox.com
Subject: Re: [R] plotting two histograms on one plot with hist function
On Tue, Jun 26, 2012 at 10:02 AM, John Kane
<jrkrid...@inbox.com<mailto:jrkrid...@inbox.com>> wrote:
Why not just plot the two histograms on the same scale in a 2 panel plot?
I think OP request was "for comparison". Two panels may do, but why not a
barplot of the histograms in the same panel ?
barplot( rbind(
hist(rbeta(30,2,4),breaks=seq(0,1,.1),plot=F)$counts,
hist(rbeta(30,6,8),breaks=seq(0,1,.1),plot=F)$counts),
beside=T)
see str(hist(yourdata)) or ?hist
Cheers
Ilai
John Kane
Kingston ON Canada
> -----Original Message-----
> From: mb...@sun.ac.za<mailto:mb...@sun.ac.za>
> Sent: Tue, 26 Jun 2012 15:24:55 +0200
> To: r-help@r-project.org<mailto:r-help@r-project.org>
> Subject: [R] plotting two histograms on one plot with hist function
>
> I would like to plot two data sets (frequency (y-axis) of mean values for
> 0-1(x=axis)) on a single histogram for comparison. The hist() only allow
> the overlay of two histograms, and although barplot() allows beside=TRUE,
> it does not show frequency values (like hist) but rather all of the
> values. Is there any way that I can use the hist() to plot two data sets
> similar to the barplot(). Any help or advice will be appreciated!
>
> Kind regards,
> Marguerite
>
>
>
>
>
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