Function shapeFun

SRC/element/CEqElement/ASDEmbeddedNodeElement.cpp:66–74

    namespace tri {

        double shapeFun(double x, double y, int i) {
            if (i == 0)
                return 1.0 - x - y;
            else if (i == 1)
                return x;
            else if (i == 2)
                return y;
            return 0.0;
        }

        void shapeFunDer(Matrix& dN) {
            dN(0, 0) = -1.0; dN(0, 1) = -1.0;