xachse=XAxisPosition;
yachse=ZAxisPosition;
Vektorx=Velocityx;
Vektory=Velocityz;
Length=sqrt(Vektorx.^2+Vektory.^2);
NVektorx=Vektorx./Length;
NVektory=Vektory./Length;
[X,Y]=meshgrid(xachse,yachse);
quiver(xachse,yachse,NVektorx,NVektory);
axis equal
hold on