How to change legend title in ggplot2 in R?

How to resize a graph in ggplot2 in R?

Last Updated : 28 Feb, 2022

In this article, we are going to see how to resize the graph in ggplot2 in the R programming language. To resize the graph we like to use option() methods in R.

option() method: It returns the height and weight of the specific graph

Syntax: option(weight, height)

Resizing a graph in ggplot2

Here we are going to see three different examples, for this, we will create a dataframe and then set the width and height using option() methods and then plot the graph using ggplot2.

Example 1:

Under this example, we are plotting a point plot with height 3 and width 2.

R

library(ggplot2)

# Create data for chart
val <-data.frame(course=c('DSA','C++','R','Python'),
                 num=c(77,55,80,60))
options(repr.plot.width = 2, repr.plot.height =3)

# Basic Line
ggplot(data=val, aes(x=course, y=num, group=1)) +geom_point()+
theme(text = element_text(size = 9),element_line(size =1))

Output:

Example 2:

In this example, we have passed the width to be 5 and height to 2 to the option() function to resize the plot,

R

library(ggplot2)

# Create data for chart
val <-data.frame(course=c('DSA','C++','R','Python'),
                 num=c(77,55,80,60))
options(repr.plot.width = 5, repr.plot.height =2)

# Basic Line
ggplot(data=val, aes(x=course, y=num, group=1)) +geom_point()+
theme(text = element_text(size = 9),element_line(size =1))

Output:

Example 3:

In this example, we have kept width to be 9 and height to 9 to resize the plot,

R

library(ggplot2)

# Create data for chart
val <-data.frame(course=c('DSA','C++','R','Python'),
                 num=c(77,55,80,60))
options(repr.plot.width =9, repr.plot.height =9)

# Basic Line
ggplot(data=val, aes(x=course, y=num, group=1)) +geom_point()+
theme(text = element_text(size = 9),element_line(size =1))

Output:

How to change legend title in ggplot2 in R?

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