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ruby measurement class example
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| class Measurement | |
| attr_accessor :count, :sum, :sum_squares, :min, :max | |
| def initialize | |
| @count, @sum, @sum_squares, @min, @max = 0, 0, 0, nil, nil | |
| end | |
| def record n | |
| @count += 1 | |
| @sum += n | |
| @sum_squares += n**2 | |
| @min ||= n | |
| @max ||= n | |
| @min = n if n < @min | |
| @max = n if n > @max | |
| end | |
| def avg | |
| sum.to_f / count | |
| end | |
| def sdev | |
| ((sum_squares - (sum*avg))/(count - 1))**0.5 | |
| end | |
| def to_s | |
| "avg: %12g sdev: %12g sum: %12g min: %12g max: %12g" % [avg, sdev, @sum, @min, @max] | |
| end | |
| end |
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