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.
Similar Triangles - find the height of the tree
Set a diagonal
It's race time again! Write a function that is at least twice as fast as the test suite call of repmat().
Arrange the names in alphabetical order (2)
Seemingly impossible problem
Add all the numbers between two limits (inclusive)
Curve fitting (linear functions) & function handles
Make your own Test Suite (part 2)
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