What is the value of C after the following MATLAB command?A = [ 1  2 ];B = [ 3  4 ];C = [ A'  [ B; B] ]';

The given MATLAB commands are:

A = [ 1 2 ];
B = [ 3 4 ];
C = [ A' [ B; B] ]';

Let's break it down:

1. A = [ 1 2 ]; This command creates a row vector A with elements 1 and 2.

2. B = [ 3 4 ]; This command creates a row vector B with elements 3 and 4.

3. [ B; B] This command concatenates vector B with itself vertically, resulting in a 2x2 matrix:

[ 3 4
  3 4 ]

4. A' This command transposes vector A, changing it from a row vector to a column vector:

[ 1
  2 ]

5. [ A' [ B; B] ]' This command concatenates the transposed A and the 2x2 matrix vertically, and then transposes the result. The final matrix C is:

[ 1 3 3
  2 4 4 ]

So, the value of C after the given MATLAB command is a 2x3 matrix:

[ 1 3 3
  2 4 4 ]