If your purpose is to compare the efficiency, I recommend you to use tic/toc or timeit instead of clock/etime. The clock function measures the operating system time which is less reliable as compared to tic/toc measurements.
So many choices
Reverse the Words (not letters) of a String
Filter values in a vector
Poker Series 01: isStraightFlush
Solve Quadratic : No * - or key functions permitted
Mastermind I: Solve all 1296 cases
USC Fall 2012 ACM : Chemical Analysis
Image Processing 003: Interferometer Data Interpolation
Vectorize the digits of an Integer
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