# Direction Vector

(Redirected from Vector Direction)

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**See:** Vector, Vector Magnitude, Tensor, Unit Vector.

## References

### 2011

- http://en.wikipedia.org/wiki/Direction_vector
- In mathematics, a
**direction vector**that describes a line segment*D*is any vector[math]\displaystyle{ \overrightarrow{AB} }[/math]

where [math]\displaystyle{ A }[/math] and [math]\displaystyle{ B }[/math] are two distinct points on the line

*D*. If v**is a direction vector for**v*D*, so is*k***for any nonzero scalar***k*; and these are in fact*all*of the direction vectors for the line*D*. Under some definitions, the direction vector is required to be a unit vector, in which case each line has exactly two direction vectors, which are negatives of each other (equal in magnitude, opposite in direction).

- In mathematics, a