WOLFRAM SYSTEM MODELER
    to_QReturn quaternion orientation object Q from orientation object T  | 
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SystemModel["Modelica.Mechanics.MultiBody.Frames.TransformationMatrices.to_Q"]

This information is part of the Modelica Standard Library maintained by the Modelica Association.
Q = TransformationMatrices.to_Q(T, Q_guess);
This function returns a quaternion object Q computed from a transformation matrix T and depending on the initial guess Q_guess.
| T | 
         Type: Orientation Description: Orientation object to rotate frame 1 into frame 2  | 
    
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| Q_guess | 
         Default Value: Quaternions.nullRotation() Type: Orientation Description: Guess value for output Q (there are 2 solutions; the one closer to Q_guess is used  | 
    
| Q | 
         Type: Orientation Description: Quaternions orientation object to rotate frame 1 into frame 2  | 
    
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