R Pie Chart

A pie chart is a circular statistical graphic, which is divided into slices to illustrate numerical proportion.

Pie charts represents data visually as a fractional part of a whole, which can be an effective communication tool.


Create Pie Chart in R

In R, we use the pie() function to create a pie chart. For example,

expenditure <- c(600, 300, 150, 100, 200)

# pie chart of of expenditure vector
result <- pie(expenditure)

print(result)

Output

Create Pie Chart Output
Create Pie Chart

In the above example, we have used the pie() function to create a pie chart of the expenditure vector.

The pie chart we have created above is plain and simple, we can add so many things to the pie chart.


Add Title to a Pie Chart in R

To add a title to our pie chart in R, we pass the main parameter inside the pie() function. For example,

expenditure <- c(600, 300, 150, 100, 200)

result <- pie(expenditure,
  main = "Monthly Expenditure Breakdown"  
)

print(result)

Output

Add Title to Pie Chart in R Output
Pie Chart With TItle

In the above figure, we can see that we have added a title to the pie chart of the expenditure vector.

result <- pie(expenditure
  main = "Monthly Expenditure Breakdown"  
)

Here, the main parameter adds the title "Monthly Expenditure Breakdown" to our pie chart.


Add Labels to Each Pie Chart Slice in R

We pass the labels parameter inside pie() to provide labels to each slice of a pie chart in R.

For example,

expenditure <- c(600, 300, 150, 100, 200)

result <- pie(expenditure,
  main = "Monthly Expenditure Breakdown",
  labels = c("Housing", "Food", "Cloths", "Entertainment", "Other")
)

print(result)

Output

Add Label to Pie Chart Slice
Pie Chart With Label

In the above example, we have used the labels parameter to provide names to each slice of pie chart. Notice the code,

pie(expenditure,
  labels = c("Housing", "Food", "Cloths", "Entertainment", "Other")
)

Here, we have assigned "Housing" to the first vector item 600, "Food" to the second vector item 300 and so on.


Change Color of Pie Slices in R

In R, we pass the col parameter inside pie() to change the color of each pie slices. For example,

expenditure <- c(600, 300, 150, 100, 200)

result <- pie(expenditure,
  main = "Monthly Expenditure Breakdown",
  labels = c("Housing", "Food", "Cloths", "Entertainment", "Other"),
  col = c("red", "orange", "yellow", "blue", "green")
)

print(result)

Output

Change Pie Chart Color Output
Change Pie Chart Color

In the above example, we have used the col parameter inside pie() to change the color of each slice of a pie chart.

pie(expenditure,
  ...
  labels = c("Housing", "Food", "Cloths", "Entertainment", "Other"),
  col = c("red", "orange", "yellow", "blue", "green")
)

Here, we have provided a vector of colors which corresponds to each label of a pie chart.


Create a 3D Pie Chart in R

In order to create a 3D pie chart, first we need to import the plotrix package. Then, we use the pie3D() function to create a 3D pie chart. For example,

# import plotrix to use pie3D()
library(plotrix)

expenditure <- c(600, 300, 150, 100, 200)

result <- pie3D(expenditure,
  main = "Monthly Expenditure Breakdown",
  labels = c("Housing", "Food", "Cloths", "Entertainment", "Other"),
  col = c("red", "orange", "yellow", "blue", "green")
)

print(result)

Output

Create 3D Pie Chart Output
Create 3D Pie Chart

Here, we have used the pie3D() function to create a 3D pie chart.

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