Function shapeFunctions

SRC/element/shell/ASDShellQ4.cpp:179–185

shape functions

    // shape functions
    inline void shapeFunctions(double xi, double eta, Vector& N)
    {
        N(0) = 0.25 * (1.0 - xi) * (1.0 - eta);
        N(1) = 0.25 * (1.0 + xi) * (1.0 - eta);
        N(2) = 0.25 * (1.0 + xi) * (1.0 + eta);
        N(3) = 0.25 * (1.0 - xi) * (1.0 + eta);
    }

    // shape function derivatives in iso-parametric space
    inline void shapeFunctionsNaturalDerivatives(double xi, double eta, Matrix& dN)