# size var (vector)

Source: https://ref.dm-lang.org/vector/var/size
Added in BYOND 516.

The magnitude of this vector. Magnitude is the square root of the summed-up squares of all its components. For instance in 3D:

size = x\*x + y\*y + z\*z

`V.size` is the same as `sqrt(V.Dot(V))`.

This value can be set at runtime, so setting `size = 1` will normalize the vector.

If the size is already 0, as in the case of a degenerate vector like 0,0, then changing this value will have no effect.

### See also
- [vector](https://ref.dm-lang.org/vector/index.md)
- [vars (vector)](https://ref.dm-lang.org/vector/var/index.md)