# 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 circle graph.

R 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

Approach: To create a simple pie chart:

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

Example:

 `# 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

Approach: To create color and title pie chart.

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

Example:

 `# 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

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

1. There are two more properties of the pie chart:
1. slice percentage
2. chart legend.
2. We can show the chart in the form of percentage as well as add legends.

Example:

 `# 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))) `

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