QECI:

Path: AC/ACCoord

% Compute ECI to body quaternion from ECI position and Euler angles.
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   Form:
   qECIToB = QECI( r, e )
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   ------
   Inputs
   ------
   r           (3,1) ECI Position vector
   e           (3,1) Euler angles [phi;theta;psi]

   -------
   Outputs
   -------
   qECIToB     (4,1) Quaternion from ECI to B

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   See also ECIToNED
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   Reference: Stevens, B.L., Lewis, F.L. , Aircraft Control and 
              Simulation, John Wiley & Sons, 1992, p. 38.
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Children:

AC: ACCoord/ECIToNED
Common: Quaternion/Mat2Q
Common: Quaternion/QMult
Common: Transform/Eul2Q

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