Any body know if there's a command in vasual basic that can plot a
vector(with direction and magnitude) as "quiver3" does in MatLab?

Thanks a lot!

Unfortunately not, there's no concept of 3D in VB at all without developing
it yourself or using an external 3D library such as DirectX.  If you want to
have a go at it yourself then hit Google and search for 3D mathematics
principles, alternatively if you want to use DirectX then you'll need a mesh
for the vector object (With the foot of the mesh centred on (0,0,0)) then
position and rotate it using a transformation matrix based on your vector.
Hope this helps,

    Mike

 -- EDais --

 - Microsoft Visual Basic MVP -
WWW: Http://EDais.earlsoft.co.uk/