1. Apr 22, 2009 #1

   geffman1

   

   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.

    

   geffman1, Apr 22, 2009
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3. Apr 22, 2009 #2

   Dick

   

   Science Advisor

   Homework Helper

   The adjoint is just the transpose, isn't it? Or are you talking about the adjugate? They are different.

    

   Dick, Apr 22, 2009
4. Apr 22, 2009 #3

   geffman1

   

   i think its the transpose of the cofactor matrix
   but i dunno how to get the cofactor matrix?? thanks

    

   geffman1, Apr 22, 2009
5. Apr 22, 2009 #4

   Dick

   

   Science Advisor

   Homework Helper

   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.

    

   Dick, Apr 22, 2009

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