Partial Differential Equation Toolbox |

pdeintrp

Interpolate from node data to triangle midpoint data

Syntax

-     ut=pdeintrp(p,t,un)

Description

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

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 the node data are stored in `un` either as N columns of length np or as an ordinary solution vector. The first np values of `un` describe the first component, the following np values of `un` describe the second component, and so on. The components of triangle data are stored in `ut` as N rows of length nt.

Cautionary

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

See Also

`assempde`, `initmesh`, `pdeprtni`

| pdegrad |  | pdejmps |