I finally understood your problem. The problem description needs some adjustment. It is not clear that it is requesting only the global variable named 'z'. I thought it was referring to every global variable.
"global variable z" was explicitly mentioned in both the problem title and the problem description. Other than that, I trust that your comment and the Test Suite should be sufficient to remove any residual doubts.
Find the sum of all the numbers of the input vector
Find the two most distant points
Create One Large Eye of size N x N Quickly?
Comparison of floating-point numbers (singles)
What score did they give?
Rate of event occurence: find percentiles of the distribution (for smallish rates)
Curve fitting (non-linear functions) & function handles
"Percentages may not total 100 due to rounding"
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