ShapeQuad4-impl.h

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namespace NumLib
{
template <class T_X, class T_N>
void ShapeQuad4::computeShapeFunction(const T_X& r, T_N& N)
{
    N[0] = (1.0 + r[0]) * (1.0 + r[1]) / 4;
    N[1] = (1.0 - r[0]) * (1.0 + r[1]) / 4;
    N[2] = (1.0 - r[0]) * (1.0 - r[1]) / 4;
    N[3] = (1.0 + r[0]) * (1.0 - r[1]) / 4;
}
 
template <class T_X, class T_N>
void ShapeQuad4::computeGradShapeFunction(const T_X& r, T_N& dN)
{
    dN[0] = +(1.0 + r[1]) / 4;
    dN[1] = -(1.0 + r[1]) / 4;
    dN[2] = -(1.0 - r[1]) / 4;
    dN[3] = +(1.0 - r[1]) / 4;
    dN[4] = +(1.0 + r[0]) / 4;
    dN[5] = +(1.0 - r[0]) / 4;
    dN[6] = -(1.0 - r[0]) / 4;
    dN[7] = -(1.0 + r[0]) / 4;
}
 
}  // namespace NumLib