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Matix mulitiplication

  1. Oct 18, 2009 #1
    wow what a day.ive got an a,b,c,d matrix mulitiplyed by an a,b,c,d.matrix and i want to know what combination off a's and b's gives the answer to the 2*2 * 2*2 question.

    ive read its a1 *a2 b1*b2 c1*c2 d1*d2 is this right as when ive done it i have got a sum that is wrong.



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 18, 2009 #2
    sorry its a composit linear transformation im looking for.
     
  4. Oct 18, 2009 #3

    Mark44

    Staff: Mentor

    When you submit a question it should follow this format:
    1. The problem statement, all variables and given/known data
    What exactly is the problem you're trying to solve? Saying that you have "an a,b,c,d matrix mulitiplyed by an a,b,c,d.matrix and i want to know what combination off a's and b's gives the answer to the 2*2 * 2*2 question" is not a problem statement that anyone can do anything helpful with.
    2. Relevant equations

    3. The attempt at a solution
    Show us what you have tried to do.
     
  5. Oct 18, 2009 #4
    ok sorry im not sure how to get the symbols on the screen will try again tommorow.
     
  6. Oct 18, 2009 #5

    Mark44

    Staff: Mentor

    Try these. Click on either one to see the LaTeX script I used. You can copy and paste the script into your post.

    [tex]\left[
    \begin{array}{c c}
    a_1 & b_1 \\
    c_1 & d_1
    \end{array}\right ][/tex]

    Here's another.

    [tex]\left[
    \begin{array}{c c}
    a_2 & b_2 \\
    c_2 & d_2
    \end{array}\right ][/tex]
     
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