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Message: [QUOTE="Eric Anderson, post: 4445999"] *Slaps hand on head* I didn't even think about sprintf. I guess I was so fixed on looking for a way to round numbers in the various Numeric objects that it didn't occur to me to look in the string functionality. sprintf() still seems a bit to C-ish for me. I kind of like my round extension that allows for an optional arg. The question is my implementation more efficient or using sprintf more efficient? Benchmark to the rescue: My implementation through 1 million iterations: user system total real No Decimal: 5.410000 0.000000 5.410000 ( 5.413982) 5 Decimal Places: 13.260000 0.000000 13.260000 ( 13.259163) 13 Decimal Places: 21.490000 0.000000 21.490000 ( 21.481821) Sprintf implementation through 1 million iterations: user system total real No Decimal: 12.400000 0.000000 12.400000 ( 12.362547) 5 Decimal Places: 15.310000 0.000000 15.310000 ( 15.549580) 13 Decimal Places: 14.700000 0.020000 14.720000 ( 16.145235) Looks like my implementation leads for the case where there are less decimal places remaining (the more common case) and sprintf leads when there are more. Of course at this point we are really just splitting hairs. :) For reference here are the implementations and benchmark script: # My implementation class Float alias :oldround :round def round( sd=0 ) return (self * (10 ** sd)).oldround.to_f / (10**sd) end end # Sprintf implementation class Float alias :oldround :round def round( sd=0 ) return ("%.#{sd}f" % self).to_f end end Benchmark script: #!/usr/bin/ruby require 'benchmark' include Benchmark require 'sprintf_round' n = 1000000 pi = 3.14159265358979 bm(17) do |test| test.report('No Decimal:') do n.times do |x| pi.round end end test.report('5 Decimal Places:') do n.times do |x| pi.round(5) end end test.report('13 Decimal Places:') do n.times do |x| pi.round(13) end end end [/QUOTE]

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