user3079834 - 1 year ago 94
R Question

# R plot random graph with same structure

I'm creating a random graph in

`R`
with the
`igraph`
-library.

``````library(igraph)
g <- erdos.renyi.game(12, 0.25)
par(mfrow=c(1,2))
plot(g)
plot(g)
``````

This creates the following plot:

As you can see, it creates two different plots - even given the same nodes and edges. How can I make R plot the same plots, so I can highlight some edges/nodes while having the same order.

The goal is to create a random network with some degree of probability that two nodes are connected by an edge (above example is
`p=0.25`
for
`n=12`
nodes). Then this graph is plotted with the nodes on the same spot (even if the node size variies) everytime I plot it.

How do I do this? Note that I'm not limited to
`g <- erdos.renyi.game(12, 0.25)`
- it just did the job with the random network quite well.

As default in igraph `layout= layout_nicely` which recalculated each plot

You can try to specify layout as matrix or as function to get coordinates

layout

Either a function or a numeric matrix. It specifies how the vertices will be placed on the plot.

If it is a numeric matrix, then the matrix has to have one line for each vertex, specifying its coordinates. The matrix should have at least two columns, for the x and y coordinates, and it can also have third column, this will be the z coordinate for 3D plots and it is ignored for 2D plots.....

For example

``````g <- erdos.renyi.game(12, 0.25)
g\$layout <- layout_as_star
par(mfrow=c(1,2))
plot(g)
plot(g)
``````

Give you

or `layout_components`

Full list you can find here

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