## RelativeCoord:

Path: Orbit/OrbitCoord

```% Computes relative coordinates between two orbits.
Find relative coordinates between an orbit defined by r and v
and orbit with position vector r2. This coordinate system uses Kaplan's
convention and is consistent with LinOrb.
--------------------------------------------------------------------------
Form:
d = RelativeCoord( r, v, r2, v2 )
--------------------------------------------------------------------------

------
Inputs
------
r               (3,:) Position vector
v               (3,:) Velocity vector
r2              (3,:) Second orbit position
v2              (3,:) Second orbit velocity

-------
Outputs
-------
d               (3,:) Relative position [dr;rtheta;z]
(6,:) And velocity if v2 is entered

--------------------------------------------------------------------------
References:	 Kaplan, M. H., Modern Spacecraft Dynamics and Control
J. Wiley, 1986, pp. 109-111.
--------------------------------------------------------------------------
```

## Children:

```Math: Linear/Cross
Math: Linear/Dot
Math: Linear/Unit
```

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