Pie Charts - R Base Graphs


Previously, we described the essentials of R programming and provided quick start guides for importing data into R.


Here, we’ll describe how to create pie charts in R. The R base function pie() can be used for this.


Pleleminary tasks

  1. Launch RStudio as described here: Running RStudio and setting up your working directory

  2. Prepare your data as described here: Best practices for preparing your data and save it in an external .txt tab or .csv files

  3. Import your data into R as described here: Fast reading of data from txt|csv files into R: readr package.

Create some data

df <- data.frame(
  group = c("Male", "Female", "Child"),
  value = c(25, 25, 50)
  )
df
##    group value
## 1   Male    25
## 2 Female    25
## 3  Child    50

Create basic pie charts: pie()

The function pie() can be used to draw a pie chart.

pie(x, labels = names(x), radius = 0.8)

  • x: a vector of non-negative numerical quantities. The values in x are displayed as the areas of pie slices.
  • labels: character strings giving names for the slices.
  • radius: radius of the pie circle. If the character strings labeling the slices are long it may be necessary to use a smaller radius.


pie(df$value, labels = df$group, radius = 1)

# Change colors
pie(df$value, labels = df$group, radius = 1,
    col = c("#999999", "#E69F00", "#56B4E9"))

Create 3D pie charts: plotix::pie3D()

Te function pie3D()[in plotrix package] can be used to draw a 3D pie chart.

Install plotrix package:

install.packages("plotrix")

Use pie3D():

# 3D pie chart
library("plotrix")
pie3D(df$value, labels = df$group, radius = 1.5, 
      col = c("#999999", "#E69F00", "#56B4E9"))

# Explode the pie chart
pie3D(df$value, labels = df$group, radius = 1.5,
      col = c("#999999", "#E69F00", "#56B4E9"),
      explode = 0.1)

Infos

This analysis has been performed using R statistical software (ver. 3.2.4).


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