MATLAB: Modify Nodes and Edges of GraphPlot

graphgraph theorygraphplotMATLABmodify dataplot

Hi. I would like to animate a graphplot. Nodes and edges should be added and removed over time, and the coordinates should be modified. Is there a way of modifying the graphplot without replotting (which I've noticed takes a lot of time)? Thanks.

Best Answer

I'm afraid that's not possible with GraphPlot.

For performance, you could use scatter to plot all the nodes, and plot to plot all edges connecting these nodes as straight lines, this would be much more efficient - of course it loses some of the additional features, like placement of the nodes in an automatic graph plot.

Or maybe you could safe the plot of each timestep ahead of time and then play the animation based on this precomputed set?

In GraphPlot, in terms of node placement, if you don't already know the coordinates at which the nodes should be placed in each timestep, you could try feeding the coordinates of the last timestep to the 'XStart', 'YStart' options for the 'force' layout, which would make the nodes in the next step be in a more similar place to the previous one. Changing 'Iterations' to a smaller number could also be helpful there.

Related Solutions

MATLAB: How to add edges to a graph plot using GraphPlot handle

There is currently no way to do this, the edges and nodes must be modified on the graph or digraph, and then this can be passed into the plot function.

Could you say some more about why you would prefer to modify them directly on the GraphPlot object?

MATLAB: How to convert graph to digraph

I'm afraid it's not possible to have both directed and undirected edges in the same graph. To convert a graph to a digraph, you could use

 gDirected = digraph(adjacency(gUndirected));

This will replace every undirected edge with two directed edges going in opposing directions. You could then use rmedge to remove the edges that go in the direction you don't want.

Within most graph algorithms, these two edges will behave the same way as the undirected edge did - but of course, the plot will look very different.

Best Answer

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MATLAB: How to add edges to a graph plot using GraphPlot handle

MATLAB: How to convert graph to digraph

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