# ggplot 2: Histogram with bell curve?

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## ggplot 2: Histogram with bell curve?

 I am learning ggplot2 commands specifically qplot for the time being and I have figured out how to create histograms and normal density curves but I am not sure how to add a normal bell curve or other dist. as well on top of a histogram. Here are the two graphs that I created. ## Histogram t<-rnorm(500) w<-qplot(t, main="Normal Random Sample", fill=I("blue"), colour=I("black"), geom="histogram") w ##Density Curve t<-rnorm(500) r<-qplot(t, main="Normal Random Sample", colour=I("black"), geom="density", adjust=4) r
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## Re: ggplot 2: Histogram with bell curve?

 Hi Don't use t as var names, because t is also a function (transpose). This code should work... set.seed(1) T <- rnorm(500) qplot(T, geom = "blank") + geom_histogram(aes(y = ..density..), colour = "black", fill = "blue") + stat_density(geom = "line", colour = "red")
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## Re: ggplot 2: Histogram with bell curve?

 > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of dicko ahmadou > Sent: Tuesday, June 07, 2011 11:41 AM > To: [hidden email] > Subject: Re: [R] ggplot 2: Histogram with bell curve? > > Hi > > Don't use t as var names, because t is also a function (transpose). > This code should work... > set.seed(1) > T <- rnorm(500) I think that it is more dangerous to use 'T' than 't' since 'T' is a built-in data name (with value TRUE) and I've seen it used more than 't' (probably because S and S+ regard it as a reserved word).  I don't think that reusing built-in names as local names is as dangerous as some would make out but reusing built-in data names is probably more dangerous than using built-in function names for local data names (because function name lookup is done differently than general name lookup - the former will only look for functions). Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > qplot(T, geom = "blank") + > geom_histogram(aes(y = ..density..), colour = "black", fill = > "blue") + > stat_density(geom = "line", colour = "red") > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/ggplot-2-Histogram-with-bell-curve-tp3580359p3580457.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > [hidden email] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
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## Re: ggplot 2: Histogram with bell curve?

 my bad....you are right I always use TRUE instead of T,  so i forgot that by default T = TRUE in R.