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How to create a dot plot using ggplot2 in R?
A dot plot is a type of histogram that display dots instead of bars and it is created for small data sets. In ggplot2, we have geom_dotplot function to create the dot plot but we have to pass the correct binwidth which is an argument of the geom_dotplot, so that we don’t get the warning saying “Warning: Ignoring unknown parameters: bins `stat_bindot()` using `bins = 30`. Pick better value with `binwidth`.”
Example
Consider the below data frame −
> x<-rnorm(100) > df1<-data.frame(x)
Loading ggplot2 package −
> library(ggplot2)
Creating the dot plot of x −
> ggplot(df1,aes(x))+geom_dotplot(binwidth=0.2)
Output
Let’s have a look at one more example −
> y<-sample(1:10,100,replace=TRUE) > df2<-data.frame(y) > ggplot(df2,aes(y))+geom_dotplot(binwidth=0.2)
Output
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