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pdetool identify boundary nodes

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Flavio Sartoretto
评论： Alan Weiss 2016-7-8
After exporting mesh nodes in "p" from pdetool to workspace, I should like to identify those nodes which pdetool assumes are boundary nodes.

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回答（1 个）

Alan Weiss
Alan Weiss 2016-7-7
I believe that you can get the [p,e,t] representation of the mesh, and then examine the list of edges e. Look at the indices k where e(6,k) or e(7,k) is 0, meaning an edge of the geometry bordering on the exterior. For details, see the mesh data description. These edges have corresponding points p that are on the boundary of the geometry.
Alan Weiss
MATLAB mathematical toolbox documentation
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Flavio Sartoretto
Flavio Sartoretto 2016-7-8
Dear Alan, I analyzed further my "e" matrix. It encloses ONLY boundary edges, no internal ones. Seems strange?!
Alan Weiss
Alan Weiss 2016-7-8
PDE Toolbox allows you to set boundary conditions only at edges of the geometry, not internal edges. So perhaps the e matrix consists only of those edges, but I don't know for sure. It might depend on how you created the geometry, whether you removed internal edges or not.
Alan Weiss
MATLAB mathematical toolbox documentation

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