WOLFRAM SYSTEM MODELER
    to_exyMap rotation object into e_x and e_y vectors of frame 2, resolved in frame 1  | 
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SystemModel["Modelica.Mechanics.MultiBody.Frames.TransformationMatrices.to_exy"]

This information is part of the Modelica Standard Library maintained by the Modelica Association.
exy = TransformationMatrices.to_exy(T);
This function returns unit vectors e_x and e_y which define axes of frame 2 resolved in frame 1, provided T is a transformation matrix to rotate frame 1 into 2.
| T | 
         Type: Orientation Description: Orientation object to rotate frame 1 into frame 2  | 
    
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| exy | 
         Type: Real[3,2] Description: = [e_x, e_y] where e_x and e_y are axes unit vectors of frame 2, resolved in frame 1  | 
    
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