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Thread: Can someone help with rotations and matrices?

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    Exalted Member hayabusaboston's Avatar
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    Can someone help with rotations and matrices?

    Lecturer and workbook is all over the place and legitimately no concrete examples whatsoever, its approaching exam time so im trying to actually start revision in depth but workbook is full of incoherent shit holy crap. I swear im not retarded lol, there was a subject feedback thing and massive majority of students said the subject is totally incoherent and never finishes explaining anything and lecturer is a rambling ghoul.

    can someone direct me how to do these pls? am looost

    https://imgur.com/a/NBAJU
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    Exalted Member hayabusaboston's Avatar
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    Re: Can someone help with rotations and matrices?

    Quote Originally Posted by hayabusaboston View Post
    Lecturer and workbook is all over the place and legitimately no concrete examples whatsoever, its approaching exam time so im trying to actually start revision in depth but workbook is full of incoherent shit holy crap. I swear im not retarded lol, there was a subject feedback thing and massive majority of students said the subject is totally incoherent and never finishes explaining anything and lecturer is a rambling ghoul.

    can someone direct me how to do these pls? am looost

    https://imgur.com/a/NBAJU


    I got 1 and 2 a,b but not c, 3,4 plsss general directions appreciated <3
    Last edited by hayabusaboston; 30 Sep 2017 at 1:47 PM.
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    Re: Can someone help with rotations and matrices?

    Quote Originally Posted by hayabusaboston View Post
    I got 1 and 2 a,b but not c, 3,4 plsss general directions appreciated <3
    Well for 2(c) for example, you should be able to show it's not linear by giving a specific example (it's basically not linear because the "length" function is not linear).

    And for 4, make sure to be familiar with the definitions of injective, surjective, and invertible (and it'll help to know about properties of these for linear maps based on the dimensions of the domain and codomain).
    Last edited by InteGrand; 30 Sep 2017 at 2:01 PM.
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    Exalted Member hayabusaboston's Avatar
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    Re: Can someone help with rotations and matrices?

    for 3 a)

    is D matrix

    (0,1,0,0...)/(0,0,2,0...)/(0,0,0,3...)?

    and M

    (1,0,0,0...)/(0,0,0,0...)/(0,1,0,0...)

    What is DoM btw?
    Quote Originally Posted by asianese View Post
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    Re: Can someone help with rotations and matrices?

    Quote Originally Posted by hayabusaboston View Post
    What is DoM btw?


    https://en.wikipedia.org/wiki/Functi...ition#Examples .
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    Exalted Member hayabusaboston's Avatar
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    Re: Can someone help with rotations and matrices?

    Preez direct some1?
    Quote Originally Posted by asianese View Post
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    Exalted Member hayabusaboston's Avatar
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    Re: Can someone help with rotations and matrices?

    WEll I googled and got them all eventually after reading the theory. Lol.
    Quote Originally Posted by asianese View Post
    Nah he's (hayabusaboston) like, God, so listen to him.
    2013 ATAR: 94.55
    Besmirch me now, for thou protectress deem it right.


    YES I LOVE MYSELF AND MY BODY BECAUSE IM BEAUTIFUL LIKE ANY OTHER FAT GIRL OR SKINNY GIRL

    But im a boy. So there's a difference.

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