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Math Help - Submatrix of A

  1. #1
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    Submatrix of A

    If A =1 3 -1 2
    2 1 0 1
    3 2 3 2
    4 1 4 1

    write down the (3,3)-submatrix of A.

    How do i start this? Can't figure it out.
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  2. #2
    Super Member girdav's Avatar
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    What is your definition of submatrix?
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  3. #3
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    Honestly, I have no clue. If you could walk me step by step, i'd get it. (obvious)
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  4. #4
    MHF Contributor FernandoRevilla's Avatar
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    Quote Originally Posted by Esthephane View Post
    Honestly, I have no clue. If you could walk me step by step, i'd get it. (obvious)

    Look here .
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  5. #5
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    So mu submatrix of (3,3) would be:

    132
    211
    411
    ?
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  6. #6
    MHF Contributor FernandoRevilla's Avatar
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    Right.
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  7. #7
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    Thanks! Now one last question, how would i be able to compute the (1,3) minor of A?
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  8. #8
    MHF Contributor FernandoRevilla's Avatar
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    \begin{vmatrix}{3}&{-1}&{2}\\{1}&{\;\;0}&{1}\\{1}&{\;\;4}&{1}\end{vmatr  ix}=\ldots
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  9. #9
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    Silly me. thanks man!
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  10. #10
    MHF Contributor FernandoRevilla's Avatar
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    Quote Originally Posted by Esthephane View Post
    Silly me.

    I don't agree.


    man!

    I agree.
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