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.
Remove all the consonants
Find relatively common elements in matrix rows
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Removing rows from a matrix is easy - but what about inserting rows?
Rate of event occurence: find percentiles of the distribution (for smallish rates)
Testing for randomness: uniform distribution of integers
The twelve days of Christmas
Anyone for tennis? Your chances of winning a tie-break game
Comparison of floating-point numbers (doubles)
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