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.
Omit columns averages from a matrix
Return the Fibonacci Sequence
"Low : High - Low : High - Turn around " -- Create a subindices vector
We love vectorized solutions. Problem 1 : remove the row average.
Raise Matrix to Power
Back to basics: throwing errors / exceptions
Testing for randomness: uniform distribution of real numbers (distribution checking)
"Percentages may not total 100 due to rounding"
Code breaker, Part II: Operation Orthos
Curve fitting (non-linear functions) & function handles
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