?? lineartriangleelementarea.m
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function y = LinearTriangleElementArea(xi,yi,xj,yj,xm,ym)
%LinearTriangleElementArea This function returns the area of the
% linear triangular element whose first
% node has coordinates (xi,yi), second
% node has coordinates (xj,yj), and
% third node has coordinates (xm,ym).
y = (xi*(yj-ym) + xj*(ym-yi) + xm*(yi-yj))/2;
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