edge numbering in matrix dl and pde model

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Jorge Garcia Garcia
评论： Jorge Garcia Garcia 2023-9-19
Hello, I have a question.
I obtain the matrix dl with the function decsg
[dl,bt] = decsg(gdm);
In dl the index column correspond to the different edges
so far so good.
I then need to divide the plate into different sections and build up the pde model :
geometryFromMesh(modelTwoDomain,msh.Nodes,msh.Elements,ElementIdToRegionId);
if i plot
pdegplot(dl,"Edgelabels","on","Facelabels","on","FaceAlpha",0.5)
pdegplot(modelTwoDomain,"Edgelabels","on","Facelabels","on","FaceAlpha",0.5)
I can see that the numbering of the edges in dl is different than the numbering of edges in modeltwodomain.
How can I find what is the numbering of edges in modeltwodomain?

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Maneet Kaur Bagga
Maneet Kaur Bagga 2023-9-18
Hi Jorge,
As per my understanding to find the numbering of edges in the "modelTwoDomain" graph, "findEdge" function can be, it returns the numeric edge indices, "idxOut" for the edges specified by the source and the target node pairs s and t.
idxOut = findEdges(modelTwoDomain,s,t);
% Display the edge numbers
disp(idxOut);
Please refer to the following documentation for further information of the "findEdge" function.
https://www.mathworks.com/help/matlab/ref/graph.findedge.html
Hope this helps!
Thank You
Maneet Bagga
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Maneet Kaur Bagga
Maneet Kaur Bagga 2023-9-18
The "dl" matrix primarily contains information about the edges, vertices, and regions of the domain.
To obtain the coordinates of the faces, you may use the "pdegeom" function instead of "decsg" to create the geometry object and then use the "geometryFromEdges" function to generate the PDE model. The resulting model will have access to the face coordinates.
Documentation link:
https://www.mathworks.com/help/pde/ug/create-geometry-using-a-geometry-function.html

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