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.
Tic Tac Toe FTW
Least common multiple of many numbers
We love vectorized solutions. Problem 1 : remove the row average.
Max index of 3D array
Rate of event occurence: find percentiles of the distribution (for smallish rates)
Anyone for tennis? Your chances of winning a (standard) game
Code breaker, Part III: Operation Xiangliu
Make your own Test Suite (part 0)
Testing for randomness: uniform distribution of integers
Find the treasures in MATLAB Central and discover how the community can help you!
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Contact your local office