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.
Magic is simple (for beginners)
Back to basics: throwing errors / exceptions
Guess the number I'm thinking of
Curve fitting (non-linear functions) & function handles
Code breaker, Part I: Operation Phoenix
Monte Carlo integration: area of a polygon
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