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How to create bar plot using ggplot2 with structure data frame?
To create bar plot using ggplot2 with structure data, we need to set the stat argument of geom_bar function to identity. This is same for the regular data frame.
For example, if we have a structured data frame called df that contains a column X for categories and a numerical column say Y for frequency then we can the bar plot for this data by using the below given command −
ggplot(df,aes(X,Y))+geom_bar(stat="identity")
Example
Following snippet creates a sample data frame −
df<-structure(list(X=c("A","B","C"),Count=c(10,18,9)),.Names=c("X","Count"),row.names=c(NA, -3L),class="data.frame") df
Output
The following dataframe is created −
X Count 1 A 10 2 B 18 3 C 9
To load ggplot2 package and create bar plot for data in df, add the following code to the above snippet −
library(ggplot2) ggplot(df,aes(x=X,y=Count))+geom_bar()
Output
If you execute all the above given snippets as a single program, it generates the following Output −
Error: stat_count() can only have an x or y aesthetic. Run `rlang::last_error()` to see where the error occurred.
The correct code to load ggplot2 package and create bar plot is as follows −
ggplot(df,aes(x=X,y=Count))+geom_bar(stat="identity")
Output
If you execute all the above given snippets as a single program, it generates the following Output −
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