MATLAB: Hi,,lets say I have a matrix,A =[1 0 1 0 0; 10 1 0; 0 0 1 0; 0 0 0 1]. How to find out that row 3 and 4 has weight one?

matrixrow operationweight

How Do I find out a specific weight number in a row of matrix?

Best Answer

sum(A,2) == 1

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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

>> 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.

MATLAB: I have a matrix [1 1 1 0; 0 1 1 0;1 1 0 1; 0 0 1 1]

A =  [1 1 1 0; 0 1 1 0;1 1 0 1; 0 0 1 1];
B = reshape(A(1:end-1),3,5);
B
B =
     1     0     1     1     0
     0     1     0     0     0
     1     1     1     1     1

To get it as 5x3 is just changing the call to reshape. You need to make sure you know in which order you want the elements to be reshaped. Remember that MATLAB stores the elements of an array going down the columns.

Best Answer

Related Solutions

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

MATLAB: I have a matrix [1 1 1 0; 0 1 1 0;1 1 0 1; 0 0 1 1]

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