====== Entering Matrix ======
  * <code>A = [16 3 2 13; 5 10 11 8; 9 6 7 12; 4 15 14 1]</code>
    * explicit list
    * load from external data files
    * generate from built-in functions
    * create from custom-built functions (M-files)

====== Column computations preferred ======
  * Matlab has a preference for working with the columns of a matrix.
    * <code>sum(A)  - sums columns into a row vector</code>
  * To work with rows, transpose a matrix, see below

====== sum, transpose, diag ======
  * switch an array as if flipping it upon both axis
  *<code>
A'                    - tranpsoses numbers and changes sign of any complex elements
A'.                   - transposes numbers w/o changing sign
sum(A')'              - sum rows into a column vector
diag(A)               - main diagonal elements of an array
sum(diag(A))          - sum of the main diagonal elements of an array
fliplr(A)             - flips the array from left to right
sum(diag(fliplr(A)))  - sum of the antidiagonal
</code>

====== Subscipts ======
  * <code>
A(row, col)  - refers to specific element in array
A(4,2) = A(8)
</code>
===== Concatenate or add to a matrix =====
  * <code>
A(4,5) = 17  - granted that the 5th column doesn't exist, it is added, with the number
</code>