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Math Help - what is the better matrix?

  1. #1
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    what is the better matrix?

    Hi, I'm just wondering which one is the better covariance matrix..

    a) to have one with only numbers along the diagonals
    b) to have one with the top diagonal number being greater than the other diagonals (but numbers do not only appear in the diagonals but in the other entries)
    c) to have the one with the last diagonal number being greater than the other diagonals (but numbers do not only appear in the diagonals but in the other entries)

    I'm thinking, a is best, then b then c.. is this correct?
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  2. #2
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    Quote Originally Posted by Dgphru View Post
    Hi, I'm just wondering which one is the better covariance matrix..

    a) to have one with only numbers along the diagonals
    b) to have one with the top diagonal number being greater than the other diagonals (but numbers do not only appear in the diagonals but in the other entries)
    c) to have the one with the last diagonal number being greater than the other diagonals (but numbers do not only appear in the diagonals but in the other entries)

    I'm thinking, a is best, then b then c.. is this correct?
    Define best

    CB
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  3. #3
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    which one would you choose if you only had to pick one of them?
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  4. #4
    Grand Panjandrum
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    Quote Originally Posted by Dgphru View Post
    which one would you choose if you only had to pick one of them?
    I would not pick one without knowing what I wanted to do with it.

    CB
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  5. #5
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    There are no bad matrices, there are only bad mathematicians!

    (Sorry, I couldn't help myself.)
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  6. #6
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    okies fair enough then

    well my homework was to pick to better design

    so i guess i should just figure it out by myself then
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  7. #7
    Grand Panjandrum
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    Quote Originally Posted by Dgphru View Post
    okies fair enough then

    well my homework was to pick to better design

    so i guess i should just figure it out by myself then
    Better design for what? The diagonal matrix with all diagonal elements the same would be a better Minimalist design. While either of the other two would be better as Abstract Expressionist designs and given the propensity of galleries to hang these upside down they could be considered the same design.

    (you will not get a sensible answer to problems unless you post the entire question and its context)

    CB
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