Cumulative standard deviation: Difference between revisions
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=={{header|Crystal}}== |
=={{header|Crystal}}== |
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{{trans|Ruby}} |
{{trans|Ruby}} |
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===Object=== |
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===Using an object to keep state:=== |
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<lang ruby>class StdDevAccumulator |
<lang ruby>class StdDevAccumulator |
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def initialize |
def initialize |
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</pre> |
</pre> |
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===Closure=== |
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{{trans|Ruby}} |
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<lang ruby>def sdaccum |
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n, sum, sum2 = 0, 0.0, 0.0 |
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->(num : Int32) do |
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n += 1 |
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sum += num |
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sum2 += num**2 |
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Math.sqrt( (sum2 * n - sum**2) / n**2 ) |
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end |
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end |
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sd = sdaccum |
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[2,4,4,4,5,5,7,9].each {|n| print sd.call(n), ", "}</lang> |
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{{out}} |
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<pre>0.0, 1.0, 0.9428090415820634, 0.8660254037844386, 0.9797958971132712, 1.0, 1.3997084244475304, 2.0</pre> |
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=={{header|D}}== |
=={{header|D}}== |
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