How to define an origin to a Spacial vector

Hello everyone!

I have one triangular mesh consequently I have an array with the normal vector of each triangles.

Here's the thing. I don't really understand how this works but this normals are free in space right?

I want to give them an origin point like. I want to define that the normal v1 must have its origin in the point 0,0,0.

How can I do this?

[Guillaume]

I think you need to explain better what you want (and what that has to do with matlab). A mathematical vector does not have an origin, that makes no sense. A vector is just a direction. However, you can certainly store a point together with a vector.