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Matrix adjoint

  1. Apr 22, 2009 #1
    hey guys, just need a little help. say your got a matrix
    1 2
    3 4

    how do you find the adjoint, i can get the right numbers but i cant work out y the signs change. any help would be helpful. thanks guys.
     
  2. jcsd
  3. Apr 22, 2009 #2

    Dick

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    The adjoint is just the transpose, isn't it? Or are you talking about the adjugate? They are different.
     
  4. Apr 22, 2009 #3
    i think its the transpose of the cofactor matrix
    but i dunno how to get the cofactor matrix?? thanks
     
  5. Apr 22, 2009 #4

    Dick

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    That's actually the adjugate not the adjoint. Try the wikipedia entry http://en.wikipedia.org/wiki/Adjugate It's pretty good and not that hard. You can also look up cofactor matrix from the same source. Also nothing wrong with the entry. You can save me a lot of writing that way.
     
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