# R – Pie Charts

A pie chart is a circular statistical graphic, which is divided into slices to illustrate numerical proportions. It depicts a special chart that uses “pie slices”, where each sector shows the relative sizes of data. A circular chart cuts in a form of radii into segments describing relative frequencies or magnitude also known as a circle graph.

## R – Pie Charts

**R Programming Language** uses the function **pie()** to create pie charts. It takes positive numbers as a vector input.

Syntax:pie(x, labels, radius, main, col, clockwise)

Parameters:

x:This parameter is a vector that contains the numeric values which are used in the pie chart.labels:This parameter gives the description to the slices in pie chart.radius:This parameter is used to indicate the radius of the circle of the pie chart.(value between -1 and +1).main:This parameter is represents title of the pie chart.clockwise:This parameter contains the logical value which indicates whether the slices are drawn clockwise or in anti clockwise direction.col:This parameter give colors to the pie in the graph.

### Creating a simple pie chart

To create a simple pie chart:

- By using the above parameters, we can draw a pie chart.
- It can be described by giving simple labels.

**Example:**

## R

`# Create data for the graph.` `geeks<- ` `c` `(23, 56, 20, 63)` `labels <- ` `c` `(` `"Mumbai"` `, ` `"Pune"` `, ` `"Chennai"` `, ` `"Bangalore"` `)` `# Plot the chart.` `pie` `(geeks, labels)` |

**Output:**

### Pie chart including the title and colors

To create color and title pie chart.

- Take all parameters which are required to make pie chart by giving a title to the chart and add labels.
- We can add more features by adding more parameters with more colors to the points.

**Example:**

## R

`# Create data for the graph.` `geeks<- ` `c` `(23, 56, 20, 63)` `labels <- ` `c` `(` `"Mumbai"` `, ` `"Pune"` `, ` `"Chennai"` `, ` `"Bangalore"` `)` `# Plot the chart with title and rainbow` `# color pallet.` `pie` `(geeks, labels, main = ` `"City pie chart"` `,` ` ` `col = ` `rainbow` `(` `length` `(geeks)))` |

**Output:**

### Slice Percentage & Chart Legend

To create chart legend and slice percentage, we can plot by doing the below methods.

- There are two more properties of the pie chart:
- slice percentage
- chart legend.

- We can show the chart in the form of percentages as well as add legends.

**Example:**

## R

`# Create data for the graph.` `geeks <- ` `c` `(23, 56, 20, 63)` `labels <- ` `c` `(` `"Mumbai"` `, ` `"Pune"` `, ` `"Chennai"` `, ` `"Bangalore"` `)` `piepercent<- ` `round` `(100 * geeks / ` `sum` `(geeks), 1)` `# Plot the chart.` `pie` `(geeks, labels = piepercent,` ` ` `main = ` `"City pie chart"` `, col = ` `rainbow` `(` `length` `(geeks)))` `legend` `(` `"topright"` `, ` `c` `(` `"Mumbai"` `, ` `"Pune"` `, ` `"Chennai"` `, ` `"Bangalore"` `),` ` ` `cex = 0.5, fill = ` `rainbow` `(` `length` `(geeks)))` |

**Output:**

## 3D Pie Chart

Here we are going to create a 3D Pie chart using plotrix package and then we will use pie3D() function to plot 3D plot.

## R

`# Get the library.` `library` `(plotrix)` `# Create data for the graph.` `geeks <- ` `c` `(23, 56, 20, 63)` `labels <- ` `c` `(` `"Mumbai"` `, ` `"Pune"` `, ` `"Chennai"` `, ` `"Bangalore"` `)` `piepercent<- ` `round` `(100 * geeks / ` `sum` `(geeks), 1)` `# Plot the chart.` `pie3D` `(geeks, labels = piepercent,` ` ` `main = ` `"City pie chart"` `, col = ` `rainbow` `(` `length` `(geeks)))` `legend` `(` `"topright"` `, ` `c` `(` `"Mumbai"` `, ` `"Pune"` `, ` `"Chennai"` `, ` `"Bangalore"` `),` ` ` `cex = 0.5, fill = ` `rainbow` `(` `length` `(geeks)))` |

**Output:**