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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)];

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Solution

The MATLAB commands provided are creating two matrices A and B.

  1. 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]

  2. 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 and A(:,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]

This problem has been solved

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