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Inverse of a diagonal matrix

  1. Jan 26, 2006 #1
    is the inverse of a diagonal matrix always just calculated by taking the inverses of each number in the matrix?
     
  2. jcsd
  3. Jan 26, 2006 #2

    HallsofIvy

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    What is the inverse of the 2 by 2 matrix all of whose entries are 1?

    For some reason, I read "symmetric matrices" where the question was about "diagonal matrices".
     
    Last edited: Jan 27, 2006
  4. Jan 26, 2006 #3

    matt grime

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    Take a diagonal matric, mutliply it by the one you just made, what's the answer?
     
  5. Feb 6, 2006 #4
    thank you very much!!!
     
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