How can I format individual edges in a directed graph?

Hi all -

I am plotting a directed graph, however the formatting is really important to get right so I can achieve the objectives in my assignment. However, I would need to format each edge individually. An edge will have certain formats if a certain condition is met.

How do I get different edge layouts in the same graph and plot it? I am not finding this anywhere on the internet. Is this possible?

All the best.

[Walter Roberson]

What kind of "formatting" is required? Color? Arrow style? Line width? Dash/dot pattern? Color range? Variable thickness? Line must take certain paths such as restricted to horizontal/vertical and 90 degree turns?

[Felipe Schuback]

basically color, arrow style (not much importante actually), line width.

[Walter Roberson]

highlight() allows you to control edgecolor and linewidth, but not arrow style.

[Felipe Schuback]

Thank you for the answer, Walter! Much appreciated. Actually I wouldn't need the arrow style to be different in different edges. Using the same arrow style would still solve my problem. But just to make sure: using the highlight() function would help me control edge color and line width correct? But would it be possible to get different edges with different colors and widths with this? How about edge line style? Like dotted lines, etc?

[Steven Lord]

See the documentation pages to which I linked in my Answer; they show how to use highlight and property manipulation to do what you're asking.

[Felipe Schuback]

Thank you very much Steven! Much appreciated. Just one last question: is there a way to loop through the edges? I wanted to do something like loop through the edges, and if the edge has a certain length, format that individual edge a certain way. How can this be done?

Best.

Answer 1

[Steven Lord]

You can control some properties of the edge lines in the plot of a graph or digraph on a per-edge basis using the highlight function or by directly manipulating the properties of the GraphPlot object as the "Edge Line Width by Weight" example on this documentation page shows.