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Math Help - matlab help

  1. #1
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    matlab help

    What does MATLAB give for C^-1? Explain this result.

    C=[2 1 1 1
    6 2 4 3
    8 -1 -3 4
    10 0 2 5]

    answer is...

    1.0e+015 *
    -1.8014 1.1259 0.4504 -0.6755
    0.0000 -0.0000 0.0000 -0.0000
    -0.0000 0 -0.0000 0.0000
    3.6029 -2.2518 -0.9007 1.3511

    what does this mean?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by saha01 View Post
    What does MATLAB give for C^-1? Explain this result.

    C=[2 1 1 1
    6 2 4 3
    8 -1 -3 4
    10 0 2 5]

    answer is...

    1.0e+015 *
    -1.8014 1.1259 0.4504 -0.6755
    0.0000 -0.0000 0.0000 -0.0000
    -0.0000 0 -0.0000 0.0000
    3.6029 -2.2518 -0.9007 1.3511

    what does this mean?
    Is that all it said? If it said something in addition do you think that might be significant?

    CB
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  3. #3
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    I suspect they may be refering to the fact that matlab operations are not peicewise on each element in the array. ie A^-1 isn't just 1/each_element but rather the inverse of the matrix itself (so I believe anyway).

    Elbarto
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  4. #4
    Grand Panjandrum
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    Quote Originally Posted by elbarto View Post
    I suspect they may be refering to the fact that matlab operations are not peicewise on each element in the array. ie A^-1 isn't just 1/each_element but rather the inverse of the matrix itself (so I believe anyway).

    Elbarto
    The matrix is singular to machine precision and I expect M. said so (possibly quoting the condition number) in addition to spiting out the given answer.

    CB
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