Test case gives away solution!
I didn't think the main MATLAB program counted as a toolbox. Oops.
I think James is right: MATLAB itself isn't normally classified as a "Toolbox". Further, I think there may be another issue too, in that the Test Suite may only be considering Toolboxes from MathWorks, and disregarding third-party Toolboxes (see my Solution 1505802 for more on this), although there is no such restriction in the Problem Statement. On the other hand, that probably wasn't an issue when this problem was created in 2012! —DIV
The answer should be 0. It is written on the FAQ: "Cody supports MATLAB and not the toolboxes".
Find relatively common elements in matrix rows
7 segment LED display
Back to basics 1 - Saving
Detect a number and replace with two NaN's
Back to basics 3 - Temp Directory
Back to basics 8 - Matrix Diagonals
Back to basics 16 - byte order
Back to basics 24 - Symbolic variables
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