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

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. ;)

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

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

Quote:

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Originally Posted by lakitu

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

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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?