Algodoo

Quark Down, there is already a function for this, which is much easier to copy. It looks like this:
math.vec.dist(pos1, pos2)
You just put in either a variable or an array in place of pos1 and pos2, and the expression will return the distance between those positions. There is also a variation called length, which calculates the length of a vector. It looks like this:
math.vec.len(vec1)
This is useful for calculating the speed of an object given its velocity, or the distance from an object to the origin.

_DIST = math.vec.dist(scene.my.pos1,scene.my.pos2)

Alright, well I didn't know that ... :