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Thread: evaluating matrices help

  1. #1

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    evaluating matrices help

    hi there how would you go about evaluating a matrices? for example. evaluate A

    A=

    (-3)
    (11)
    (6)

    i need to know this for my homework? it sounds simple but my book does not cover this. Any help would be great.

    Kind Regards

    Lakitu

  2. #2
    Fanatic Member VBAhack's Avatar
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    Re: evaluating matrices help

    Two comments:

    1. You'll need to explain what 'evaluate' means. For a square matrix, I could imagine that finding the determinant might be considered evaluating, but for a column matrix, I can't even guess what 'evaluate' means.

    2. You already posted the same question before:
    http://www.vbforums.com/showthread.php?t=401682
    For future reference, rather than double post, it would be better to reply to your own post to bring it to the top.

  3. #3

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    Re: evaluating matrices help

    thank you i will in future. Evaluate | u | is exactly what it says on my paper, does that make sense?

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    Frenzied Member yrwyddfa's Avatar
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    Re: evaluating matrices help

    Looks to me as if evaluating |u| means describe the vector u ie it's magnitude and direction.

    Here's an example of doing a 2d vector; the one you're describing is 3d
    "As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality." - Albert Einstein

    It's turtles! And it's all the way down

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    Fanatic Member VBAhack's Avatar
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    Re: evaluating matrices help

    Quote Originally Posted by lakitu
    thank you i will in future. Evaluate | u | is exactly what it says on my paper, does that make sense?
    I think it means magnitude (like yrwyddfa said). For a 3D vector, magnitude is:

    d = sqrt(x^2 + y^2 + z^2)

    If this is homework, then I would expect there to be a book involved that explains these things. No?

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