how to use quiver3 plot vectors at zero points(i want to set the start point of the vectors all at zero points)

[x,y,z]=meshgrid(-3:1:3,-3:1:3,-3:1:3);

dx=x;

dy=y;

dz=z;

r=(dx.^2+dy.^2+dz.^2).^0.5;

u=dx./r;

v=dy./r;

w=dz./r;

figure

quiver3(x,y,z,u,v,w)

Answer 1

[KSSV]

Simple, make x,y,z matrices as zeros matrix.

[x,y,z]=meshgrid(-3:1:3,-3:1:3,-3:1:3);
dx=x;
dy=y;
dz=z;
r=(dx.^2+dy.^2+dz.^2).^0.5;
u=dx./r;
v=dy./r;
w=dz./r;

x = 0*x ; 
y = 0*y ; 
z = 0*z ; 

figure
quiver3(x,y,z,u,v,w)

[金麟 陈]

[x,y,z]=meshgrid(-3:1:3,-3:1:3,-3:1:3);
dx=x;
dy=y;
dz=z;
r=(dx.^2+dy.^2+dz.^2).^0.5;
u=dx./r;
v=dy./r;
w=dz./r;
figure
quiver3(x-x,y-y,z-z,u,v,w)% i achieve this operation in another way.