MATLAB: 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 10×10 matrix of zeros

matrixonesvectorszeros

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 10×10 matrix of zeros (I used this command: zeros(10,10)). Does anyone know what this means and how do I do it?
Thanks

Best Answer

>> 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
>>
zeros(10,10) which is the same as zeros(10) creates 10 by 10 matrix with zeros and with the above code ones are filled in 2nd row and in 5th column.
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