** Convert a list of mesh edges to a graph or matrix. **

** [A,xy] = UNMESH(M) **

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** Input: **

** Each row of M is a mesh edge in two dimensions, [x1 y1 x2 y2]. **

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** Output: **

** A is the Laplacian matrix of the mesh (the symmetric adjacency matrix **

** with -1 for edges and degrees on diagonal). **

** Each row of xy is a coordinate [x y] of a mesh point. **

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** See also MPLOT, GPLOT , SUBMESH. **

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