QError:

Path: Common/Quaternion

--------------------------------------------------------------------------
   Small angle errors between two quaternions.
   This routine gives the correct sign when both vectors transform from 
   frame a to frame b and frame b is the body frame. If the convention is 
   reversed you must reverse the sign.
   To force the positive first element convention enter any 3rd argment.
--------------------------------------------------------------------------
   Form:
   angle = QError( qRef, qMeas, pos )
--------------------------------------------------------------------------

   ------
   Inputs
   ------
   qRef            (4,1)  Reference quaternion
   qMeas           (4,1)  Measured quaternion
   pos             (1,1)  If entered make the first element positive
                          always

   -------
   Outputs
   -------
   angle           (3,1)  Vector of small angular errors (rad)

--------------------------------------------------------------------------

Children:

Common: Quaternion/QMult
Common: Quaternion/QPose

Back to the Common Module page