[R] plot numeric vs character

[John Kane]

Another approach using ggplot2 and shamelessly swiped from
http://www.sthda.com/english/wiki/ggplot2-dot-plot-quick-start-guide-r-software-and-data-visualization.

library(ggplot2)
ggplot(mydf, aes(x=let, y=num)) + 
  geom_dotplot(binaxis='y', stackdir='center', dotsize = 0.5)




John Kane
Kingston ON Canada


> -----Original Message-----
> From: ivan.calandra at univ-reims.fr
> Sent: Thu, 17 Mar 2016 11:29:52 +0100
> To: r-help at r-project.org
> Subject: [R] plot numeric vs character
> 
> Dear useRs,
> 
> I would like to plot data points in a simple scatterplot. I don't have a
> lot of data per category, so a boxplot does not make sense.
> 
> Here are some sample data:
> mydf <- data.frame(let=rep(letters[1:3],each=3), num=rnorm(9),
> stringsAsFactors=FALSE)
> 
> I would like to do that, which throws an error, most likely because x is
> character:
> plot(mydf$let, mydf$num)
> 
> If I convert to factor(), it plots a boxplot with no possibility (AFAIK)
> to plot points:
> mydf$let <- factor(mydf$let)
> plot(mydf$let, mydf$num, type='p')
> 
> I know I can use the function points() in a somewhat convoluted manner:
> plot(mydf$num, xlim=c(1,3), type='n', xaxt='n')
> axis(side=1, at=1:3, labels=levels(mydf$let))
> points(as.numeric(mydf$let), mydf$num)
> 
> Isn't there a simple(r) way? Maybe I just missed something obvious...
> 
> Thank you in advance for your help,
> Ivan
> 
> --
> Ivan Calandra, PhD
> University of Reims Champagne-Ardenne
> GEGENAA - EA 3795
> CREA - 2 esplanade Roland Garros
> 51100 Reims, France
> +33(0)3 26 77 36 89
> ivan.calandra at univ-reims.fr
> --
> https://www.researchgate.net/profile/Ivan_Calandra
> https://publons.com/author/705639/
> 
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