## Draw Pie Chart in R programming language

Pie Chart is a pictorial representation of proportions in a whole as sectors in a circle.

In this tutorial, we will learn how to draw a pie chart using R programming.

R programming language provides two functions – pie() and pie3d() to draw pie charts.

### Syntax of R pie function

```pie(x, labels = NULL, edges = 200, radius = 0.8,
clockwise = FALSE, init.angle = 0,
density = NULL, angle = 0, col = NULL, border = NULL,
lty = NULL, main = NULL, …)```

where

• x [mandatory] is a numerical vector with values >=0. Each values decides the proportion of circle.
• labels is a character vector. They are names for the slices.
• edges the circular outline of the pie is approximated by a polygon with this many edges.
• radius of the circle in pie chart.
• clockwise represents the logical indicating if slices are drawn clockwise or counter clockwise. counter clockwise is default. {TRUE,FALSE}
• init.angle is the initial angle(in degrees) to start with for drawing sectors. [0,360]
• density of shading lines, in lines per inch
• angle is the slope of shading lines in degrees (counter-clockwise).
• col is a vector of colors to be used in filling or shading the slices.
• border, lty – arguments passed to polygon which draws each slice.
• main is an overall title for the plot.
• … is graphical parameters can be given as arguments to pie. They will affect the main title and labels only.

### Example 1 – Simple Pie Chart

In this example, we will write an R program, to draw a basic pie chart.

example.R – R Program

```# Data Pie chart
x = c(4, 1, 3, 1, 2)
labels = c('breakfast', 'brunch', 'lunch', 'snacks', 'dinner')
colors = c('#4286f4','#bb3af2','#ed2f52','#efc023','#ea7441')

# Give the chart file a name.
png(file = "diet.png")

# Plot the chart.
pie(x, labels, main='Daily Diet Plan', col=colors, init.angle=180, clockwise=TRUE)

# Save the file.
dev.off()```

When the above program is run, following pie chart is created at the location of your Rscript.

### Example 2 – Pie Chart with Striped Lines

In this example, we will write an R program to draw a pie chart with striped lines in the sector area.

example.R – R Program

```# Draw Pie Chart in R
# Data Pie chart
x = c(4, 1, 3, 1, 2)
labels = c('breakfast', 'brunch', 'lunch', 'snacks', 'dinner')
colors = c('#4286f4','#bb3af2','#ed2f52','#efc023','#ea7441')

# Give the chart file a name.
png(file = "diet.png")

# Plot the chart.
pie(x, labels, main='Daily Diet Plan',density=30 ,col=colors, angle=45)

# Save the file.
dev.off()```

### Example Pie Chart with Edged sectors

In this example, we will draw a Pie Chart with edged sectors. Instead of circular outer edges, we get straight lines.

example.R – R Program

```# Draw Pie Chart in R
# Data Pie chart
x = c(4, 1, 3, 1, 2)
labels = c('breakfast', 'brunch', 'lunch', 'snacks', 'dinner')
colors = c('#4286f4','#bb3af2','#ed2f52','#efc023','#ea7441')

# Give the chart file a name.
png(file = "diet.png")

# Plot the chart.
pie(x, labels, main='Daily Diet Plan',edges=1 ,col=colors)

# Save the file.
dev.off()```

### Syntax of R pie3D function

plotrix library is required to use it in an Rscript.

```pie3D(x,edges=NA,radius=1,height=0.1,theta=pi/6,start=0,border=par("fg"),
col=NULL,labels=NULL,labelpos=NULL,labelcol=par("fg"),labelcex=1.5,

x [mandatory] is a numerical vector with values >=0. Each values decides the proportion of circle.where

• labels is a character vector. They are names for the slices.
• radius of the circle in pie chart.
• col is a vector of colors to be used in filling or shading the slices.
• main is an overall title for the plot.
• explode is the amount by which sectors are exploded
• … extra arguments

### Example 1 – Simple 3D Pie Chart in R

In this example, we will use pie3D() function, and draw a 3D Pie Diagram.

example.R – R Program

```# Draw Pie Chart in R
# Get the library.
library(plotrix)

# Data for Pie chart
x = c(4, 1, 3, 1, 2)
labels = c('breakfast', 'brunch', 'lunch', 'snacks', 'dinner')
colors = c('#4286f4','#bb3af2','#ed2f52','#efc023','#ea7441')

# Give the chart file a name.
png(file = "diet3d.png")

# Plot the chart.
pie3D(x, labels=labels, explode=0.1, height=0.05, main='Daily Diet Plan', col=colors)

# Save the file.
dev.off()```

When the above program is run, following pie chart is created at the location of your Rscript.

### Conclusion

In this R Tutorial, we have learnt to draw Pie Chart in R programming language in 2D and 3D.