Symbolic Quaternion Multiplication












7












$begingroup$


It is possible to do the symbolic multiplication $qq^*$ of a quaternion $q=a+bi+cj+dk$ by its conjugate $q^*=a-bi-cj-dk$ using Mathematica? It seems that Quaternion package only works with numeric entries.










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$endgroup$








  • 4




    $begingroup$
    Use ** instead of * to "multiply" 2 quaternions.
    $endgroup$
    – Carl Woll
    Nov 19 '18 at 17:19








  • 1




    $begingroup$
    Try a new package named GTPack.
    $endgroup$
    – Αλέξανδρος Ζεγγ
    Nov 20 '18 at 2:53










  • $begingroup$
    Thanks for all the relevant contributions!
    $endgroup$
    – robson denke
    Nov 28 '18 at 20:01
















7












$begingroup$


It is possible to do the symbolic multiplication $qq^*$ of a quaternion $q=a+bi+cj+dk$ by its conjugate $q^*=a-bi-cj-dk$ using Mathematica? It seems that Quaternion package only works with numeric entries.










share|improve this question









$endgroup$








  • 4




    $begingroup$
    Use ** instead of * to "multiply" 2 quaternions.
    $endgroup$
    – Carl Woll
    Nov 19 '18 at 17:19








  • 1




    $begingroup$
    Try a new package named GTPack.
    $endgroup$
    – Αλέξανδρος Ζεγγ
    Nov 20 '18 at 2:53










  • $begingroup$
    Thanks for all the relevant contributions!
    $endgroup$
    – robson denke
    Nov 28 '18 at 20:01














7












7








7


2



$begingroup$


It is possible to do the symbolic multiplication $qq^*$ of a quaternion $q=a+bi+cj+dk$ by its conjugate $q^*=a-bi-cj-dk$ using Mathematica? It seems that Quaternion package only works with numeric entries.










share|improve this question









$endgroup$




It is possible to do the symbolic multiplication $qq^*$ of a quaternion $q=a+bi+cj+dk$ by its conjugate $q^*=a-bi-cj-dk$ using Mathematica? It seems that Quaternion package only works with numeric entries.







symbolic quaternions






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asked Nov 19 '18 at 17:06









robson denkerobson denke

811512




811512








  • 4




    $begingroup$
    Use ** instead of * to "multiply" 2 quaternions.
    $endgroup$
    – Carl Woll
    Nov 19 '18 at 17:19








  • 1




    $begingroup$
    Try a new package named GTPack.
    $endgroup$
    – Αλέξανδρος Ζεγγ
    Nov 20 '18 at 2:53










  • $begingroup$
    Thanks for all the relevant contributions!
    $endgroup$
    – robson denke
    Nov 28 '18 at 20:01














  • 4




    $begingroup$
    Use ** instead of * to "multiply" 2 quaternions.
    $endgroup$
    – Carl Woll
    Nov 19 '18 at 17:19








  • 1




    $begingroup$
    Try a new package named GTPack.
    $endgroup$
    – Αλέξανδρος Ζεγγ
    Nov 20 '18 at 2:53










  • $begingroup$
    Thanks for all the relevant contributions!
    $endgroup$
    – robson denke
    Nov 28 '18 at 20:01








4




4




$begingroup$
Use ** instead of * to "multiply" 2 quaternions.
$endgroup$
– Carl Woll
Nov 19 '18 at 17:19






$begingroup$
Use ** instead of * to "multiply" 2 quaternions.
$endgroup$
– Carl Woll
Nov 19 '18 at 17:19






1




1




$begingroup$
Try a new package named GTPack.
$endgroup$
– Αλέξανδρος Ζεγγ
Nov 20 '18 at 2:53




$begingroup$
Try a new package named GTPack.
$endgroup$
– Αλέξανδρος Ζεγγ
Nov 20 '18 at 2:53












$begingroup$
Thanks for all the relevant contributions!
$endgroup$
– robson denke
Nov 28 '18 at 20:01




$begingroup$
Thanks for all the relevant contributions!
$endgroup$
– robson denke
Nov 28 '18 at 20:01










2 Answers
2






active

oldest

votes


















8












$begingroup$

Needs["Quaternions`"]
q = Quaternion[a, b, c, d];
q ** Conjugate[q]



Quaternion[a^2 + b^2 + c^2 + d^2, 0, 0, 0]







share|improve this answer









$endgroup$





















    2












    $begingroup$

    The following links might be helpful to you:



    https://www.mathematica-journal.com/2018/05/computational-aspects-of-quaternionic-polynomials/



    https://www.mathematica-journal.com/2018/07/computational-aspects-of-quaternionic-polynomials-2/



    http://blog.wolframalpha.com/2011/08/25/quaternion-properties-and-interactive-rotations-with-wolframalpha/






    share|improve this answer









    $endgroup$









    • 5




      $begingroup$
      Please keep in mind that answers which provide only links are discouraged. Try to summarized the contents of the linked articles in the answer, so that if a link ever goes dead the answer will still be of use.
      $endgroup$
      – silvascientist
      Nov 19 '18 at 23:55











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    2 Answers
    2






    active

    oldest

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    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    8












    $begingroup$

    Needs["Quaternions`"]
    q = Quaternion[a, b, c, d];
    q ** Conjugate[q]



    Quaternion[a^2 + b^2 + c^2 + d^2, 0, 0, 0]







    share|improve this answer









    $endgroup$


















      8












      $begingroup$

      Needs["Quaternions`"]
      q = Quaternion[a, b, c, d];
      q ** Conjugate[q]



      Quaternion[a^2 + b^2 + c^2 + d^2, 0, 0, 0]







      share|improve this answer









      $endgroup$
















        8












        8








        8





        $begingroup$

        Needs["Quaternions`"]
        q = Quaternion[a, b, c, d];
        q ** Conjugate[q]



        Quaternion[a^2 + b^2 + c^2 + d^2, 0, 0, 0]







        share|improve this answer









        $endgroup$



        Needs["Quaternions`"]
        q = Quaternion[a, b, c, d];
        q ** Conjugate[q]



        Quaternion[a^2 + b^2 + c^2 + d^2, 0, 0, 0]








        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 19 '18 at 17:37









        Thies HeideckeThies Heidecke

        6,9362638




        6,9362638























            2












            $begingroup$

            The following links might be helpful to you:



            https://www.mathematica-journal.com/2018/05/computational-aspects-of-quaternionic-polynomials/



            https://www.mathematica-journal.com/2018/07/computational-aspects-of-quaternionic-polynomials-2/



            http://blog.wolframalpha.com/2011/08/25/quaternion-properties-and-interactive-rotations-with-wolframalpha/






            share|improve this answer









            $endgroup$









            • 5




              $begingroup$
              Please keep in mind that answers which provide only links are discouraged. Try to summarized the contents of the linked articles in the answer, so that if a link ever goes dead the answer will still be of use.
              $endgroup$
              – silvascientist
              Nov 19 '18 at 23:55
















            2












            $begingroup$

            The following links might be helpful to you:



            https://www.mathematica-journal.com/2018/05/computational-aspects-of-quaternionic-polynomials/



            https://www.mathematica-journal.com/2018/07/computational-aspects-of-quaternionic-polynomials-2/



            http://blog.wolframalpha.com/2011/08/25/quaternion-properties-and-interactive-rotations-with-wolframalpha/






            share|improve this answer









            $endgroup$









            • 5




              $begingroup$
              Please keep in mind that answers which provide only links are discouraged. Try to summarized the contents of the linked articles in the answer, so that if a link ever goes dead the answer will still be of use.
              $endgroup$
              – silvascientist
              Nov 19 '18 at 23:55














            2












            2








            2





            $begingroup$

            The following links might be helpful to you:



            https://www.mathematica-journal.com/2018/05/computational-aspects-of-quaternionic-polynomials/



            https://www.mathematica-journal.com/2018/07/computational-aspects-of-quaternionic-polynomials-2/



            http://blog.wolframalpha.com/2011/08/25/quaternion-properties-and-interactive-rotations-with-wolframalpha/






            share|improve this answer









            $endgroup$



            The following links might be helpful to you:



            https://www.mathematica-journal.com/2018/05/computational-aspects-of-quaternionic-polynomials/



            https://www.mathematica-journal.com/2018/07/computational-aspects-of-quaternionic-polynomials-2/



            http://blog.wolframalpha.com/2011/08/25/quaternion-properties-and-interactive-rotations-with-wolframalpha/







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Nov 19 '18 at 17:20









            Gilmar Rodriguez PierluissiGilmar Rodriguez Pierluissi

            605212




            605212








            • 5




              $begingroup$
              Please keep in mind that answers which provide only links are discouraged. Try to summarized the contents of the linked articles in the answer, so that if a link ever goes dead the answer will still be of use.
              $endgroup$
              – silvascientist
              Nov 19 '18 at 23:55














            • 5




              $begingroup$
              Please keep in mind that answers which provide only links are discouraged. Try to summarized the contents of the linked articles in the answer, so that if a link ever goes dead the answer will still be of use.
              $endgroup$
              – silvascientist
              Nov 19 '18 at 23:55








            5




            5




            $begingroup$
            Please keep in mind that answers which provide only links are discouraged. Try to summarized the contents of the linked articles in the answer, so that if a link ever goes dead the answer will still be of use.
            $endgroup$
            – silvascientist
            Nov 19 '18 at 23:55




            $begingroup$
            Please keep in mind that answers which provide only links are discouraged. Try to summarized the contents of the linked articles in the answer, so that if a link ever goes dead the answer will still be of use.
            $endgroup$
            – silvascientist
            Nov 19 '18 at 23:55


















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