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?

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

Answer 1

[madhan ravi]

>> 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.

[Tai Lopez]

I understand now, thank you very much!

[madhan ravi]

you’re welcome