Interpolate from triangle midpoint data to node data


un = pdeprtni(p,t,ut)


un = pdeprtni(p,t,ut) gives linearly interpolated values at node points from the values at triangle midpoints.

The geometry of the PDE problem is given by the mesh data p and t. For details on the mesh data representation, see initmesh.

Let N be the dimension of the PDE system, np the number of node points, and nt the number of triangles. The components of triangle data in ut are stored as N rows of length nt. The components of the node data are stored in un as N columns of length np.


pdeprtni and pdeintrp are not inverse functions. The interpolation introduces some averaging.

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