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Code Listing by Teodor Kichatov

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fork of http://code.activestate.com/recipes/269554-select-the-nth-smallest-element/
O(n) quicksort style algorithm for looking up data based on rank order. Useful for finding medians, percentiles, quartiles, and deciles. Equivalent to [data[n] for n in positions] when the data is already sorted.



Search nth smallest float in really big file (more, more and more bigger than available RAM)
in a single pass through the file

if your file more than 150GB - you should use a more appropriate sampling params to the data
more -...