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.
Replace NaNs with the number that appears to its left in the row.
Factorize THIS, buddy
Give me Hamming on five, hold the mayo
Comparison of floating-point numbers (doubles)
Make your own Test Suite (part 1)
The twelve days of Christmas
Testing for randomness: uniform distribution of real numbers (distribution checking)
Code breaker, Part II: Operation Orthos
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