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DiagrammeR is a package in R that is used to create graphs and flowcharts using Graphviz and Mermaid. This can be useful for displaying data. In this article, well cover how to create graphs using the grViz() in the DiagrammeR package, including:

DiagrammeR is a package within htmlwidgets for R. Its used to generate graphs using Graphviz and Mermaid library.

In order to install DiagrammeR to create plot graphs, there are two steps. First, youll create an R Markdown document, which will set the output to HTML. Then, youll install the DiagrammeR package. Heres how:

In RStudio Go to File New File R Markdown. Then, give the title and select the output format as HTML.

The R Markdown document will have the title and other information at the top.

Below that we will have R chunks which have delimiters ```{r} and ```.

When you render the R Markdown document, it will run each chunk and embed the results beneath the code chunk or you can run each code chunk and the result will be displayed for that code chunk.

We can knit the R Markdown document to HTML output.

Go to Packages Install on the right side of the RStudio and enter the package name DiagrammeR and click Install.

And thats it, youve installed DiagrammeR.

An error occurred.

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DiagrammeR package uses the grViz() function for Graphviz graphs. Lets see how to use grViz() function to create graphs.

While creating a graph, we have to mention the layout, node attributes, edge attributes and connection.In the graph below, green color circles are called nodes. A=15, B=10, etc. are the labels of the nodes. The-> arrow mark is known as the edges. Heres how to set the node, edge attributes, label and substitutions and connections required to create it.

The default layout is the dot.

Include the node shape, color, style and width, etc. that you want for your graph.

Detail your edge attributes. These include color, arrowhead, arrow tail, pen width and direction, etc.

We have to include the label and substitution for the node.

@@1 -> is the substitution.

Here,1 is the footnote number. The value 15 will be substituted in place of 1 when the graph is rendered.

In my graph A is connected to B and C. B is connected to D and C is connected to E.

Lets create another graph where nodes A and C are in the same rank and B, and E are in the same rank.

If we mention rank=same {A->C}, A and C nodes will be placed in the same line.

Lets create a node from the down arrow of another node.

Heres how to create the graph mentioned above.

First, we have to create a blank node.

After that we can make the blank node label = and the width and height to be very small (0.01).

The next step is to remove the arrow mark. It can be removed by mentioning the edge attribute dir=none.

Select the option knit -> knit to html.

The whole R Markdown document will be rendered into an HTML document.

If you dont want the r-code to be displayed in the HTML output, mention echo =False in the r-chunk code.

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DiagrammeR is a package in R that allows the creation of graphs using Graphviz and mermaid styles. In this article, we have covered using Graphviz style. We have covered how to create nodes, labels, edges, connections and layouts for the graphs using the grViz() function in the DiagrammeR package. We have also covered node attributes, edge attributes, labels and their substitutions. We have covered only the dot layout, which is the default layout in this article.

Read more:

How to Plot Graphs Using the DiagrammeR Package in R - Built In