how to calculate the area of each triangle of the mesh in the pdetool box?

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gui
gui 2016-8-4
回答： Alan Weiss 2016-8-8
how to calculate the area of each triangle of the mesh in the pdetool box?

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回答（2 个）

KSSV
KSSV 2016-8-4
If you have nodal connectivity matrix and coordinates in hand, use the below code:
function A = triarea(p,t)
% TRIAREA: Area of triangles assuming counter-clockwise (CCW) node
% ordering.
%
% P : Nx2 array of XY node co-ordinates
% T : Mx3 array of triangles as indices into P
% A : Mx1 array of triangle areas
% Darren Engwirda - 2007
d12 = p(t(:,2),:)-p(t(:,1),:);
d13 = p(t(:,3),:)-p(t(:,1),:);
A = (d12(:,1).*d13(:,2)-d12(:,2).*d13(:,1));
end % triarea()
Alan Weiss
Alan Weiss 2016-8-8
You can use the pdetrg function on the p,e,t representation of the mesh. If you are using the PDEModel framework, use meshToPet to extract the appropriate data structures.
Alan Weiss
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