Vector
======

Create a vector using an existing reference frame and specified distances.

**Keyword Arguments**

:param str name: Key to be used when referencing this vector in the mechanism.vectors dictionary.

:param str ref_point_key: Key of the point used to mark the start of the vector.

:param str ref_frame_key: Key of the frame in which the x, y, z components are measured.

:param str x: Key of the parameter or generalized coordinate for distance in x- component of the reference frame.

:param str y: Key of the parameter or generalized coordinate for distance in y- component of the reference frame.

:param str z: Key of the parameter or generalized coordinate for distance in z- component of the reference frame.