base/ElemMassMat2DP1.m

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function AElem=ElemMassMat2DP1(area)
% function AElem=ElemMassMat2DP1(area)
%   Computation of the element mass matrix for
%  `P_1`-Lagrange finite elements
%
% Parameters:
%  area: triangle area
%
% Return values:
%  AElem: Element mass matrix, `3\times 3` matrix
% ``AElem=\frac{area}{12}\left( \begin{array}{ccc}
%  2 &1 &1 \\
%  1 &2 &1 \\
%  1 &1 &2
%  \end{array} \right)``
%
% Example:
%  @verbatim 
%    area=1/2.;
%    AElem=ElemMassMat2DP1(area);
%  @endverbatim
% Copyright:
%   See \ref license
AElem=(area/12)*[2 1 1; 1 2 1; 1 1 2];