days <- read.csv("Datasets/Example_Data.csv", header = FALSE) # To convert and flatten data from a data frame you can use the unlist command. myDays <- unlist(days, use.names=FALSE) # myDays is now a simple vector data type that I can work with. # Now plot the boxplot boxplot(myDays) # add manually an outlier here myDays <-c(myDays, 45) # Now plot the boxplot boxplot(myDays) # you can turn the outlier detection off by setting outline=FALSE boxplot(myDays, outline=FALSE)