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Multiplying row exchange matrices

  1. Feb 23, 2016 #1
    1. The problem statement, all variables and given/known data
    Multiply these row excahnge matrices in the order pq qp and p^2
    p =
    [0 1 0]
    [1 0 0]
    [0 0 1]

    q=
    [0 0 1]
    [0 1 0]
    [1 0 0]
    2. Relevant equations


    3. The attempt at a solution
    I don't understand why the solution is
    [0 1 0]
    [0 0 1]
    [1 0 0]

    do you not multiply rows by columns? When i do this i just get a 3x3 with 0s in the entire matrix. I don't understand, what am I doing wrong? Since this is a fundamental misunderstanding from my part.
     
  2. jcsd
  3. Feb 23, 2016 #2
    nevermind i'm an idiot.

    plz delete/close
     
  4. Feb 24, 2016 #3

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    Welcome to the club!
     
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