Sigh! There should really be some quality control on Cody, to save us from stupid problems like this...
The third element of aVec in the the image contained within your problem description does not match the third element of aVec used in the test suite.
Sum of diagonal of a square matrix
Flip the main diagonal of a matrix
middleAsColumn: Return all but first and last element as a column vector
Summation of array
05 - Vector Equations 1
02 - Vector Variables 4
02 - Vector Variables 2
07 - Common functions and indexing 2
03 - Matrix Variables 4
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