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Quick matrices question (maths)

Discussion in 'General Discussion' started by 50/50, 1 May 2006.

  1. 50/50

    PermaBanned

    Joined: 24 Jul 2003

    Posts: 2,585

    my cousin has asked me to solve this, but i really dont know how to :o

    Find the value(s) of k for which the matrix

    M =

    1/2 k
    -k 1/2

    is an orthogonal matrix.


    any ideas?
     
  2. Arcade Fire

    Banned

    Joined: 26 Jan 2005

    Posts: 5,426

    Location: Cambridge

    On orthogonal matrix is one for which the transpose is the same as the inverse. Do you know how to invert and transpose that matrix?

    Edit: What's with all the maths questions tonight?!
     
    Last edited: 1 May 2006
  3. 50/50

    PermaBanned

    Joined: 24 Jul 2003

    Posts: 2,585


    oh duuuh... thats easy

    thanks