How do I add data labels to a bar chart in R?
To put the labels over the bars for each bar, you can use the following:
- ggplot(data=dat, aes(x=Types, y=Number, fill=sample)) +
- geom_bar(position = ‘dodge’, stat=’identity’) +
- geom_text(aes(label=Number), position=position_dodge(width=0.9), vjust=-0.25)
How do I create a Barchart in R?
Bar plots can be created in R using the barplot() function. We can supply a vector or matrix to this function. If we supply a vector, the plot will have bars with their heights equal to the elements in the vector. Let us suppose, we have a vector of maximum temperatures (in degree Celsius) for seven days as follows.
How do I change the color of a Barplot in R?
It is also possible to change manually barplot fill colors using the functions :
- scale_fill_manual() : to use custom colors.
- scale_fill_brewer() : to use color palettes from RColorBrewer package.
- scale_fill_grey() : to use grey color palettes.
What does Names ARG do in R?
names. arg: This parameter is a vector of names appearing under each bar in bar chart. col: This parameter is used to give colors to the bars in the graph.
What is a bar chart label?
Bar charts are useful because they show data clearly. They must contain the following information: A title explaining what the bar chart means. Labels that tell you what each bar means. This could be a key or just a label underneath the line that runs along the bottom of the bar graph (the horizontal axis).
How do I add a legend to a barplot in R?
In R you can add a legend to any plot using the legend() command. You can also use the legend = TRUE parameter in the barplot() command. The barplot() command is the only general plot type that has a legend parameter (the others need a separate legend).
What is the difference between Geom_col and Geom_bar?
geom_bar() makes the height of the bar proportional to the number of cases in each group (or if the weight aesthetic is supplied, the sum of the weights). If you want the heights of the bars to represent values in the data, use geom_col() instead. geom_col() uses stat_identity() : it leaves the data as is.