what does "put a vector of ones in the 2nd row and a vector of ones in the 5th column" mean when I have a 10x10 matrix of zeros?

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Tai Lopez 2018-10-8

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评论： madhan ravi 2018-10-9

Hello,

I've been asked to put a vector of ones in the 2nd row and a vector of ones on the 5th column. I have a 10x10 matrix of zeros (I used this command: zeros(10,10)). Does anyone know what this means and how do I do it?

Thanks

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Answer 1

madhan ravi 2018-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/422899-what-does-put-a-vector-of-ones-in-the-2nd-row-and-a-vector-of-ones-in-the-5th-column-mean-when-i-h#answer_340391

编辑：madhan ravi 2018-10-8

在 MATLAB Online 中打开

>> A=zeros(10,10)
A(2,:)=1
A(:,5)=1
A =
    Columns 1 through 8
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
    Columns 9 through 10
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
A =
    Columns 1 through 8
       0     0     0     0     0     0     0     0
       1     1     1     1     1     1     1     1
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0
    Columns 9 through 10
       0     0
       1     1
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
A =
    Columns 1 through 8
       0     0     0     0     1     0     0     0
       1     1     1     1     1     1     1     1
       0     0     0     0     1     0     0     0
       0     0     0     0     1     0     0     0
       0     0     0     0     1     0     0     0
       0     0     0     0     1     0     0     0
       0     0     0     0     1     0     0     0
       0     0     0     0     1     0     0     0
       0     0     0     0     1     0     0     0
       0     0     0     0     1     0     0     0
    Columns 9 through 10
       0     0
       1     1
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
       0     0
>>