here what I did ..
using pymol1- I loaded post and pre-processing object2- I aligned them 
together3- I tried to get the transformation matrix with this commandprint 
cmd.get_object_matrix("pre-processing object")and this step returns a 4*4 
matrices(-0.017042629420757294, 0.6273888349533081, -0.7785196304321289, 
-27.565351122804373, 0.15071848034858704, 0.7713475823402405, 
0.6183096766471863, -142.13367787636093, 0.9884297847747803, 
-0.1067996621131897, -0.10770488530397415, -81.02178268868633, 0.0, 0.0, 0.0, 
1.0)I am not sure if this is the right way or not?and if it is right what 
should I do in order to apply it to the post-processing object ? should I apply 
it as it is or the inverse of it?
Thank you, Fedaa Ali 
    On Saturday, December 1, 2018, 5:59:37 PM GMT+2, Fedaa Nada via PyMOL-users 
<pymol-users@lists.sourceforge.net> wrote:  
 
 After optimizing the structure the coordinates transforms to another frame, 
what I need to do is to transfer back to the original coordinates by getting 
the transformation matrix when I tried to get this matrix using pymol, I got an 
error and I can't figure out the problem because I am new to pymol.
please, could anyone help me how to get the transformation matrix? 

Thank you Fedaa Ali   _______________________________________________
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