On 09/19/2016 03:15 PM, Jiaqi ZHANG wrote:


I was trying to get the values of the solution polynomial in the
neighbor cells in DG,

for example, I want to compute
View the MathML source

where p_i are the solution polynomials of the neighbors, \Delta_0 is the
current cell.

I cannot find any function to do this in Finite elements
<http://www.dealii.org/8.4.1/doxygen/deal.II/group__feall.html> ยป Finite
element access/FEValues classes
<http://www.dealii.org/8.4.1/doxygen/deal.II/group__feaccess.html>

How should I implement this in deal.II?

You mean that you want to *extend the solution from the neighboring cell to the current cell*? In general, the polynomials that describe the solution are of course only defined on one cell, and there is a separate polynomial description on the neighboring cell.

Best
 Wolfgang

--
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Wolfgang Bangerth          email:                 bange...@colostate.edu
                           www: http://www.math.colostate.edu/~bangerth/

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