# How to Make a Pie Chart in R A pie chart is a circular chart that is divided into slices to represent the portions of a whole. This tutorial explains how to create a pie chart in R using the package ggplot2.

## Creating a Pie Chart in R

To create a pie chart in R, we can either use Base R or download a package like ggplot2.

### Using Base R

To create a pie chart in base R, we can create some fake data and use the pie() function to create  a basic pie chart:

```#create some fake data
amounts <- c(10, 11, 13, 22, 44)
categories <- c('A', 'B', 'C', 'D', 'E')

#make a pie chart using the data above
pie(amounts, labels = categories, main='Pie Chart')
```

This generates the following pie chart: In order to add annotated percentages to the chart, we can use the following code:

```amounts <- c(10, 11, 13, 22, 44) #create five different amounts
categories <- c('A', 'B', 'C', 'D', 'E') #create five category names
percents <- round(amounts/sum(amounts)*100) #determine % of whole for each amount
categories <- paste(categories, percents) #add percents to the labels
categories <- paste(categories,'%',sep='') #add the "%" sign to the labels
pie(amounts,labels = categories, main="Pie Chart") #create chart w/ annotated labels```

This generates the following pie chart with percentage labels: ## Using ggplot2

We can also use the package ggplot2 to create a pie chart.

We’ll use the same fake dataset that we made above to create the pie chart.

```#create some fake data
data <- data.frame("category" = c('A', 'B', 'C', 'D', 'E'),
"amount" = c(10, 11, 13, 22, 44))
data
# category amount
#1   A      10
#2   B      11
#3   C      13
#4   D      22
#5   E      44
```

Then we’ll create the actual pie chart:

```#create some fake data
data <- data.frame("category" = c('A', 'B', 'C', 'D', 'E'),
"amount" = c(10, 11, 13, 22, 44)) 