# 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 on 8 Oct 2018
Commented: madhan ravi on 9 Oct 2018
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

madhan ravi on 8 Oct 2018
Edited: madhan ravi on 8 Oct 2018
>> 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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madhan ravi on 9 Oct 2018
you’re welcome