What is the value of B after the following MATLAB commands?A = eye(2,2);B = [ A(:,1) A(:,2)];
Question
What is the value of B after the following MATLAB commands?
A = eye(2,2);
B = [ A(:,1) A(:,2)];
Solution
The MATLAB commands provided are creating two matrices A and B.
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A = eye(2,2);This command creates a 2x2 identity matrix, A. An identity matrix is a square matrix in which all the elements of the principal diagonal are ones and all other elements are zeros. So, matrix A will look like this:A = [1 0; 0 1]
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B = [ A(:,1) A(:,2)];This command creates a new matrix B by concatenating the columns of matrix A.A(:,1)means all rows in the first column of A andA(:,2)means all rows in the second column of A.
So, the matrix B will look exactly the same as A because you are just reassembling the columns of A into B. Therefore, B will be:
B = [1 0; 0 1]
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