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.
Rosenbrock's Banana Function and its derivatives
Put two time series onto the same time basis
Calculate a modified Levenshtein distance between two strings
Curve fitting (non-linear functions) & function handles
What score did they give?
Make your own Test Suite (part 0)
Curve fitting (linear functions) & function handles
Code breaker, Part II: Operation Orthos
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