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Math Help - A question about vector

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    A question about vector

    If x is a vector,and center it on the origin,but what dose the formula (x.1=0) mean?I am puzzled about why there is a point symbol behind vector x,and what does 1 mean?
    I really appreciate your help! The image below is the original text
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  2. #2
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    Re: A question about vector

    Hello,

    Common notation for the scalar product.
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    Re: A question about vector

    hi,can you speak in detail? My english is very poor,and can you give me a example? thank you very much
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    Re: A question about vector

    You mean the point symbol means scalar product?but 1 means a vector that each element equals to 1?
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    Re: A question about vector

    Quote Originally Posted by Moo View Post
    Hello,

    Common notation for the scalar product.
    You mean the point symbol means scalar product?but 1 means a vector that each element equals to 1?
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    Re: A question about vector

    Quote Originally Posted by ChinaPanda View Post
    You mean the point symbol means scalar product?but 1 means a vector that each element equals to 1?
    Yes, 1 stands for \begin{pmatrix} 1\\1\\ \vdots \\ 1\end{pmatrix}

    This scalar product will actually give the sum of x's components.

    duibuqi, wo bu hui shuo zhongwen shuxue
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  7. #7
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    Re: A question about vector

    Quote Originally Posted by Moo View Post
    Yes, 1 stands for \begin{pmatrix} 1\\1\\ \vdots \\ 1\end{pmatrix}

    This scalar product will actually give the sum of x's components.

    duibuqi, wo bu hui shuo zhongwen shuxue

    wow ,you're great! scalar product in chinese is dian cheng,dian (点)means a point,cheng(乘)means product
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