How to change line width in ggplot2?

ggplot2 is a data visualization package for the statistical programming language R. This article discusses how can we change line width in ggplot2. For this, only the size parameter in the geom_line() function has to be initialized to the required value.

Syntax:

geom_line(mapping=NULL, data=NULL, stat=”identity”, position=”identity”,…)

Approach

• Import module
• Create data frame
• Create plot with a line
• Display plot

Let us first draw a regular plot so that the difference is better understandable and apparent.

Example:

R

library(ggplot2)

data <- data.frame(
  name=c("A","B","C","D","E"),
  value=c(3,12,5,18,45)
)

# For Create a simple line graph
ggplot(data, aes(x=name, y=value, group=1)) +
  geom_line()

Output:

Simple line graph using ggplot2

Setting the required value to the size parameter of geom_line() will produce a line plot of the required width.

Example:

R

library(ggplot2)

data <- data.frame(
  name=c("A","B","C","D","E"),
  value=c(3,12,5,18,45)
)

# For create line graph with change of size and color.
ggplot(data, aes(x=name, y=value, group=1)) +
  geom_line(size=3, color="green")

Output: 

Modified Line Graph using ggplot2