MATLAB: How to concatenate matrices

matrices

Create a 4×4 magic matrix A. Use MATLAB to assemble a new matrix B. I'm not sure how to turn the 4×4 matrix A in to a 2×2 matrix B, where first row: A 2A, second row: A^2 A+2
    A = magic(4)
    B = [A 2A; A.^2 A+2]

Best Answer

You must have got an error message when executing - what did it say? That should be your first clue as to what's wrong with the code.
In your case, the multiplication sign is missing '*'.
A = magic(4)
B = [A 2*A; A.^2 A+2]
Output:
>> B
B =
      16     2     3    13    32     4     6    26
       5    11    10     8    10    22    20    16
       9     7     6    12    18    14    12    24
       4    14    15     1     8    28    30     2
     256     4     9   169    18     4     5    15
      25   121   100    64     7    13    12    10
      81    49    36   144    11     9     8    14
      16   196   225     1     6    16    17     3
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