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Message: [QUOTE="Stefano Taschini, post: 4512483"] Consider e.g. the computation of the median of an array with floats. If your input data are floats and your result is also a float, may ask you why you want to round them? If you are actually thinking of rounding errors, i.e., the fact that (1/2.0) + (1/3.0) != 5/6.0, well, they are independent of Float#round. By the way, the median [1] is hardly biased by rounding errors. It's the mean that is sensitive to that. Ciao, Stefano [1] [URL]http://mathworld.wolfram.com/StatisticalMedian.html[/URL] [/QUOTE]