'Returns a Vector distance between this Point and the other Point.
Parameters
otherpoint : Point
The otherpoint we are locating this one relative to
Examples
>>> from sympy.physics.vector import Point, ReferenceFrame
>>> N = ReferenceFrame(\'N\')
>>> p1 = Point(\'p1\')
>>> p2 = Point(\'p2\')
>>> p1.set_pos(p2, 10 * N.x)
>>> p1.pos_from(p2)
10*N.x'

def pos_from(self, otherpoint):

    outvec = Vector(0)
    plist = self._pdict_list(otherpoint, 0)
    for i in range((len(plist) - 1)):
        outvec += plist[i]._pos_dict[plist[(i + 1)]]
    return outvec
