How do I calculate an x with a circle in it and a variable raised to -T?












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I am trying to design a decoupler to break a MIMO system down to a distributed SISO system for control. I am reading a paper on how to do that, but it is telling me to compute some strange stuff that I am not understanding. Please see the below computations:
enter image description here



How is the second equation computed? The x inside the circle usually represents the tensor product in math literature, so the dimensions of the new matrix should be the multiplication of the size of the two original matrices. Since originally, the matrices are 2x2, the resultant matrix should be 4 x 4. I assume the -T does not represent the inverse of the transpose?










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    1












    $begingroup$


    I am trying to design a decoupler to break a MIMO system down to a distributed SISO system for control. I am reading a paper on how to do that, but it is telling me to compute some strange stuff that I am not understanding. Please see the below computations:
    enter image description here



    How is the second equation computed? The x inside the circle usually represents the tensor product in math literature, so the dimensions of the new matrix should be the multiplication of the size of the two original matrices. Since originally, the matrices are 2x2, the resultant matrix should be 4 x 4. I assume the -T does not represent the inverse of the transpose?










    share|cite|improve this question











    $endgroup$















      1












      1








      1





      $begingroup$


      I am trying to design a decoupler to break a MIMO system down to a distributed SISO system for control. I am reading a paper on how to do that, but it is telling me to compute some strange stuff that I am not understanding. Please see the below computations:
      enter image description here



      How is the second equation computed? The x inside the circle usually represents the tensor product in math literature, so the dimensions of the new matrix should be the multiplication of the size of the two original matrices. Since originally, the matrices are 2x2, the resultant matrix should be 4 x 4. I assume the -T does not represent the inverse of the transpose?










      share|cite|improve this question











      $endgroup$




      I am trying to design a decoupler to break a MIMO system down to a distributed SISO system for control. I am reading a paper on how to do that, but it is telling me to compute some strange stuff that I am not understanding. Please see the below computations:
      enter image description here



      How is the second equation computed? The x inside the circle usually represents the tensor product in math literature, so the dimensions of the new matrix should be the multiplication of the size of the two original matrices. Since originally, the matrices are 2x2, the resultant matrix should be 4 x 4. I assume the -T does not represent the inverse of the transpose?







      exponentiation tensor-products






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      edited Jan 29 at 22:57







      Rui Nian

















      asked Jan 29 at 22:25









      Rui NianRui Nian

      1264




      1264






















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          $begingroup$

          Turns out the x with the circle in it did not represent a tensor product, rather, it represented an element-wise multiplication...



          So it is solved by taking the transpose of the inverse of K, and then doing element-wise multiplication.






          share|cite|improve this answer









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            $begingroup$

            Turns out the x with the circle in it did not represent a tensor product, rather, it represented an element-wise multiplication...



            So it is solved by taking the transpose of the inverse of K, and then doing element-wise multiplication.






            share|cite|improve this answer









            $endgroup$


















              2












              $begingroup$

              Turns out the x with the circle in it did not represent a tensor product, rather, it represented an element-wise multiplication...



              So it is solved by taking the transpose of the inverse of K, and then doing element-wise multiplication.






              share|cite|improve this answer









              $endgroup$
















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                $begingroup$

                Turns out the x with the circle in it did not represent a tensor product, rather, it represented an element-wise multiplication...



                So it is solved by taking the transpose of the inverse of K, and then doing element-wise multiplication.






                share|cite|improve this answer









                $endgroup$



                Turns out the x with the circle in it did not represent a tensor product, rather, it represented an element-wise multiplication...



                So it is solved by taking the transpose of the inverse of K, and then doing element-wise multiplication.







                share|cite|improve this answer












                share|cite|improve this answer



                share|cite|improve this answer










                answered Jan 29 at 22:41









                Rui NianRui Nian

                1264




                1264






























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