How to change line width in ggplot2?

How to Add Caption to a ggplot in R?

Last Updated : 27 Jan, 2022

In this article, we are going to see how we can add a caption to a plot in R Programming Language. The caption is much important in data visualization to display some details related to graphs.

Preparing Data

To plot the scatterplot we will use we will be using the geom_point() function. Following is brief information about the ggplot function, geom_point().

Syntax : geom_point(size, color, fill, shape, stroke)

Parameter :

size : Size of Points

color : Color of Points/Border

fill : Color of Points

shape : Shape of Points in in range from 0 to 25

stroke : Thickness of point border

Return : It creates scatterplots.

R

# import lib 
library(ggplot2) 
  
# plot datapoint using iris 
ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width)) + 
    geom_point() 

Output:

Adding a caption to a plot

To add caption we will use caption attributes from labs() function.

Syntax: labs(caption)

Parameters:

caption: String caption

R

library(ggplot2) 
ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width)) + 
    geom_point()+ 
  
    # adding caption and subtitle 
    labs(subtitle="Scatter plot", 
       caption="Geeksforgeeks"
       )

Output:

Customize caption text

element_text() methods can be used to customize the caption within graph

R

library(ggplot2) 
ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width)) + 
    geom_point()+ 
  
    # adding caption and subtitle 
    labs(subtitle="Scatter plot - Examples", 
       caption="Geeksforgeeks")+  
  
    # size of the caption 
    theme(plot.caption= element_text(size=15, 
                                   color="Green"))

Output:

How to change line width in ggplot2?

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