MATLAB: How to load edges and nodes into a matlab network

centralitygisnetwork analysisnodes

Is it possible to load edges and nodes into matlab for network/graph analysis (I want to model node centrality on a real network)?

I have a point file (file 1) With XYZ coordinates and unique name for nodes.

I have an edge file with two columns that describe the start and end nodes in file 1. (this was a polyline export from ArcGIS).

Any resources you could point me to would be greatly appreciated! I'm trying to model river network centrality…

This may not be possible… just was curious as I'm a beginner.

Best Answer

Yes, MATLAB has several functions to create and analyze graphs. Read here: https://www.mathworks.com/help/matlab/graph-and-network-algorithms.html

This shows how to create undirected graph(): https://www.mathworks.com/help/matlab/ref/graph.html or directed graph(): https://www.mathworks.com/help/matlab/ref/digraph.html.

Related Solutions

MATLAB: How to add nodes and edges

You can use addedge() to add edges.

MATLAB: Delete and add new edges in a graph

A graph object is undirected. A digraph object is directed.

Construct your network graph using digraph instead of graph on the fourth line of your code.

By the way, the addedge function has two capabilities you might find useful.

The s (source) and t (target) inputs can be vectors to add multiple edges at once.
If the source and/or target inputs reference nodes that don't yet exist, addedge adds them.

So you could do this with something like:

% Make a digraph and plot it for later reference
G = digraph(triu(ones(3)));
figure;
plot(G)
% How many nodes does G have?
N = numnodes(G);
% Add 2 new nodes
newnodes = [N+1 N+2];
% Add the edges between 1 and N+1, N+1 and N+2, and N+2 and 2
%

% I'm doing this in a copy of G, rather than G itself so you can go back
% and compare G and G2. But you can modify G itself if you want.
%
% Because of the way I created G, it's a weighted digraph, so I need
% to give the new edges weights. I chose to weight them all pi.
% Scalar expansion lets me specify a scalar weight to be used for each new edge.
G2 = addedge(G, [1 newnodes], [newnodes 2], pi);
% Eliminate the edge from 1 to 2
G2 = rmedge(G2, 1, 2);
% Plot the new digraph
figure;
plot(G2)

Best Answer

Related Solutions

MATLAB: How to add nodes and edges

MATLAB: Delete and add new edges in a graph

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