Plot Dendrogram with R and ggraph

In this article, we are going to see how to customize dendrogram. It is also known as a tree diagram and it is a visual representation of the hierarchical relationship between items. A dendrogram's main purpose is to figure out the best approach to assign objects to clusters. 

Creating Basic Dendrogram

To create a dendrogram we will igraph package which is used for creating and manipulating graphs and analyzing networks graph. So for creating a dendrogram, we will create a dataframe into the hierarchical data structure and then transform it into an edge list. To plot a Dendrogram we will use the following syntax:

ggraph(dataset, layout)

Parameters:

• Dataframe: Hierarchical dataset/vector
• layout: Dimension of layout
• Circular: True/False

Syntax to install and import igraph package in the R working console:

install.package('igraph')

library(igraph)

There are some optional functions to create edge into diagonal we will use geom_edge_diagonal() methods and to add nodes into a graph we will use geom_node_point() methods.

Output:

 

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Circular Layout Dendrogram

 

To create a circular layout we will use circular = True, which will plot it into the circular layout.

 

Output:

 

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Edge style Dendrogram

 

To make the straight edge dendrogram we will use geom_edge_diagonal() methods.

 

Output:

 

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Labels in Dendrogram

 

To add the labels into the dendrogram we will use geom_node_text() which will add the labels into the graph into a hierarchical structure

 

Output:

 

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Customize Labels in Dendrogram

 

To Customize Labels in Dendrogram we use geom_node_text() which will add the labels along with color into the graph into the hierarchical structure

 

Output:

 

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Customize Nodes in Dendrogram

 

To Customize Labels in Dendrogram we use geom_node_point() which will add the nodes along with color into the graph into a hierarchical structure

 

Output:

 

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