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.
Determine if input is odd
Is this group simply connected?
Index of neighbor pixel with steepest gradient
Generate N equally spaced intervals between -L and L
Moving average (variable kernel length)
Computational power of Cody servers
Comparison of floating-point numbers (doubles)
Just take it easy for a second or two!
Curve fitting (linear functions) & function handles
Code breaker, Part III: Operation Xiangliu
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