ggraph | Grammar of Graph Graphics | Data Visualization library

I was wondering if it is possible to plot a tidygraph object with a single node? For example, if I create some data and a tidygraph object with 2 nodes, that would look like this:

Using this reproducable example from another question. How do I label / colour the center node on which the local neighborhood graph is based. (In this case 'x')

I have a graph with each node having a value (value in red).

I would like to do the following two things (I guess 1 is a special case of 2):

1. Each node should be assigned the mean of the value of the direct peers directing to it. For example node #5 (1+2)/2=1.5 or node #3 (0+2+0)/3=2/3.

2. Instead of direct neighbors, include all connected nodes but with a diffusion of times 1/n with n being the distance to the node. The further away the information is coming from the weaker signal we'd have.

I looked into functions of igraph, but could not find anything that is doing this (I might have overseen though). How could I do this computation?

Below is the code for a sample network with random values.

Is it possible to control the horizontal order of nodes in a ggraph tree?

• The following code creates a tree:

I recently asked this question about how to colour nodes by variable. And the code works great. However, I'm back trying to colour the terminal nodes separately. For example, if I create some data, then turn them into tidygraph objects and plot them using ggraph then I get something like this:

I'd like to modify the legend in my plot (see below) by adjusting the number of columns (e.g. from one column with nine rows to three columns and three rows). I already tried to add guides(alpha = guide_legend(ncol = 3)) to adjust the number of columns. However, that didn't work (I assume 'alpha' is not the correct argument but I can't find the appropriate one).

Example code and plot:

I am using as_tbl_graph and ggraph to show the network relation data. I wish to keep the shape and location of each node, while changing the color with several conditions. Problem here is that every time I run the code, the full graph image changes at all. Is there a way to keep the shape of the graph, but only change the color? There are so many items so I can't designate each node's location.

I have been trying to create a dendrogram with hierarchical edge bundling using the ggraph package, and have run into 2 major issues.

Questions and code are revised slightly for clarity

• Firstly, the graph seems to always start from arbitrary points on the circle, while the default should be 90 degrees (12 o'clock). Setting different values for the offset argument, which should be passed to [layout_tbl_graph_dendrogram()]2 also has no effect. Vertices 6 and 41, connected by the red and yellow edges, should be the first and last vertices and fall near 90 degrees.
• The second issue is that I wish for overlapping edges (those connecting the same vertices) to be very slightly offset, but usual ggplot2 functions such as position_dodge() shift the entire edge. I don't want any shifts where edges are connected to the vertices, but without position_dodge() or similar functions (or with position_dodge(width=0)) the red edge completely covers the yellow, as they share the same two vertices (6 and 41).

Here's a reproducible example: