Vektorbetrag

$$\left\vert \vec{u} \right\vert = \sqrt[]{\vec{u} \vec{u}} = \sqrt[]{u_{x}^{2} + u_{y}^{2} + u_{z}^{2} }$$ (1.11)

double VBG(double *v0){  return sqrt (SPR(v0,v0));  }// Vektorbetrag