Mathematica won't multiply a numeric matrix by a symbolic matrix

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2
down vote

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If



I1 = 1,0,1,-1


and 



Acl = A , -B*K,C*L, A-B*K-C*L


where A, B, C, and D are not defined in the notebook. When I multiply the two matrices like this:



I1.Acl


Mathematica gives me the following:



Not actually multiplied together



Whereas if I don't multiply the I1 and Acl but multiply the contents of the variables directly (with parenthesis around each element of the matrice). Mathematica gives me the answer as I would expect. Like this:



Desired form



How can I multiply a two symbolic matrices together such that I get an answer that an actual matrice multiplication instead of just displaying what I asked Mathematica to do. I'm sure this is a stupid question, but I searched Stack Exchange for 10 minutes using various search strings. In addition I searched Youtube, and Google.



Wolfram alpha gives me the answer as I would have expected. In the same form as if I had done the multiplication by hand. Mathematica won't.



Mathematica Version 11.3






matrix







share|improve this question



























    up vote
    2
    down vote

    favorite












    If



    I1 = 1,0,1,-1


    and 



    Acl = A , -B*K,C*L, A-B*K-C*L


    where A, B, C, and D are not defined in the notebook. When I multiply the two matrices like this:



    I1.Acl


    Mathematica gives me the following:



    Not actually multiplied together



    Whereas if I don't multiply the I1 and Acl but multiply the contents of the variables directly (with parenthesis around each element of the matrice). Mathematica gives me the answer as I would expect. Like this:



    Desired form



    How can I multiply a two symbolic matrices together such that I get an answer that an actual matrice multiplication instead of just displaying what I asked Mathematica to do. I'm sure this is a stupid question, but I searched Stack Exchange for 10 minutes using various search strings. In addition I searched Youtube, and Google.



    Wolfram alpha gives me the answer as I would have expected. In the same form as if I had done the multiplication by hand. Mathematica won't.



    Mathematica Version 11.3






    matrix







    share|improve this question

























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      If



      I1 = 1,0,1,-1


      and 



      Acl = A , -B*K,C*L, A-B*K-C*L


      where A, B, C, and D are not defined in the notebook. When I multiply the two matrices like this:



      I1.Acl


      Mathematica gives me the following:



      Not actually multiplied together



      Whereas if I don't multiply the I1 and Acl but multiply the contents of the variables directly (with parenthesis around each element of the matrice). Mathematica gives me the answer as I would expect. Like this:



      Desired form



      How can I multiply a two symbolic matrices together such that I get an answer that an actual matrice multiplication instead of just displaying what I asked Mathematica to do. I'm sure this is a stupid question, but I searched Stack Exchange for 10 minutes using various search strings. In addition I searched Youtube, and Google.



      Wolfram alpha gives me the answer as I would have expected. In the same form as if I had done the multiplication by hand. Mathematica won't.



      Mathematica Version 11.3






      matrix







      share|improve this question















      If



      I1 = 1,0,1,-1


      and 



      Acl = A , -B*K,C*L, A-B*K-C*L


      where A, B, C, and D are not defined in the notebook. When I multiply the two matrices like this:



      I1.Acl


      Mathematica gives me the following:



      Not actually multiplied together



      Whereas if I don't multiply the I1 and Acl but multiply the contents of the variables directly (with parenthesis around each element of the matrice). Mathematica gives me the answer as I would expect. Like this:



      Desired form



      How can I multiply a two symbolic matrices together such that I get an answer that an actual matrice multiplication instead of just displaying what I asked Mathematica to do. I'm sure this is a stupid question, but I searched Stack Exchange for 10 minutes using various search strings. In addition I searched Youtube, and Google.



      Wolfram alpha gives me the answer as I would have expected. In the same form as if I had done the multiplication by hand. Mathematica won't.



      Mathematica Version 11.3






      matrix




      matrix






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 18 mins ago









      David G. Stork

      21.6k11746




      21.6k11746










      asked 2 hours ago









      frequencydrive

      184




      184




















          1 Answer
          1






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          3
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          It looks your I1 matrix is being used while wrapped in a MatrixForm. Otherwise, it works just fine.



          1, 0, 1, -1.a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l




          MatrixForm[1, 0, 1, -1].a, -b k, c l, a - b k - c l


          enter image description here



          That being said, one could also have



          MatrixForm[1, 0, 1, -1][[1]].a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l







          share|improve this answer






















          • Oh shoot. I did "wrap" it in MatrixForm. I thought MatrixForm was just a formatting command. I didn't think it did anything to my matrices. Thank you for your reply. That was it.
            – frequencydrive
            2 hours ago






          • 1




            @frequencydrive If you find the answer useful, please consider accepting it as an answer.
            – Johu
            1 hour ago










          • Related: mathematica.stackexchange.com/questions/166709
            – John Doty
            1 hour ago










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          1 Answer
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          1 Answer
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          active

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          up vote
          3
          down vote













          It looks your I1 matrix is being used while wrapped in a MatrixForm. Otherwise, it works just fine.



          1, 0, 1, -1.a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l




          MatrixForm[1, 0, 1, -1].a, -b k, c l, a - b k - c l


          enter image description here



          That being said, one could also have



          MatrixForm[1, 0, 1, -1][[1]].a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l







          share|improve this answer






















          • Oh shoot. I did "wrap" it in MatrixForm. I thought MatrixForm was just a formatting command. I didn't think it did anything to my matrices. Thank you for your reply. That was it.
            – frequencydrive
            2 hours ago






          • 1




            @frequencydrive If you find the answer useful, please consider accepting it as an answer.
            – Johu
            1 hour ago










          • Related: mathematica.stackexchange.com/questions/166709
            – John Doty
            1 hour ago














          up vote
          3
          down vote













          It looks your I1 matrix is being used while wrapped in a MatrixForm. Otherwise, it works just fine.



          1, 0, 1, -1.a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l




          MatrixForm[1, 0, 1, -1].a, -b k, c l, a - b k - c l


          enter image description here



          That being said, one could also have



          MatrixForm[1, 0, 1, -1][[1]].a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l







          share|improve this answer






















          • Oh shoot. I did "wrap" it in MatrixForm. I thought MatrixForm was just a formatting command. I didn't think it did anything to my matrices. Thank you for your reply. That was it.
            – frequencydrive
            2 hours ago






          • 1




            @frequencydrive If you find the answer useful, please consider accepting it as an answer.
            – Johu
            1 hour ago










          • Related: mathematica.stackexchange.com/questions/166709
            – John Doty
            1 hour ago












          up vote
          3
          down vote










          up vote
          3
          down vote









          It looks your I1 matrix is being used while wrapped in a MatrixForm. Otherwise, it works just fine.



          1, 0, 1, -1.a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l




          MatrixForm[1, 0, 1, -1].a, -b k, c l, a - b k - c l


          enter image description here



          That being said, one could also have



          MatrixForm[1, 0, 1, -1][[1]].a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l







          share|improve this answer














          It looks your I1 matrix is being used while wrapped in a MatrixForm. Otherwise, it works just fine.



          1, 0, 1, -1.a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l




          MatrixForm[1, 0, 1, -1].a, -b k, c l, a - b k - c l


          enter image description here



          That being said, one could also have



          MatrixForm[1, 0, 1, -1][[1]].a, -b k, c l, a - b k - c l



          a, -b k, a - c l, -a + c l








          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 1 hour ago

























          answered 2 hours ago









          That Gravity Guy

          1,149512




          1,149512











          • Oh shoot. I did "wrap" it in MatrixForm. I thought MatrixForm was just a formatting command. I didn't think it did anything to my matrices. Thank you for your reply. That was it.
            – frequencydrive
            2 hours ago






          • 1




            @frequencydrive If you find the answer useful, please consider accepting it as an answer.
            – Johu
            1 hour ago










          • Related: mathematica.stackexchange.com/questions/166709
            – John Doty
            1 hour ago
















          • Oh shoot. I did "wrap" it in MatrixForm. I thought MatrixForm was just a formatting command. I didn't think it did anything to my matrices. Thank you for your reply. That was it.
            – frequencydrive
            2 hours ago






          • 1




            @frequencydrive If you find the answer useful, please consider accepting it as an answer.
            – Johu
            1 hour ago










          • Related: mathematica.stackexchange.com/questions/166709
            – John Doty
            1 hour ago















          Oh shoot. I did "wrap" it in MatrixForm. I thought MatrixForm was just a formatting command. I didn't think it did anything to my matrices. Thank you for your reply. That was it.
          – frequencydrive
          2 hours ago




          Oh shoot. I did "wrap" it in MatrixForm. I thought MatrixForm was just a formatting command. I didn't think it did anything to my matrices. Thank you for your reply. That was it.
          – frequencydrive
          2 hours ago




          1




          1




          @frequencydrive If you find the answer useful, please consider accepting it as an answer.
          – Johu
          1 hour ago




          @frequencydrive If you find the answer useful, please consider accepting it as an answer.
          – Johu
          1 hour ago












          Related: mathematica.stackexchange.com/questions/166709
          – John Doty
          1 hour ago




          Related: mathematica.stackexchange.com/questions/166709
          – John Doty
          1 hour ago

















           

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