Averages/Pythagorean means: Difference between revisions
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<pre>5.5 4.52872868812 3.41417152147</pre> |
<pre>5.5 4.52872868812 3.41417152147</pre> |
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=={{header|Ruby}}== |
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{{works with|Ruby|1.9+}} |
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<lang ruby>class Array |
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def arithmetic_mean |
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inject(:+).to_f / length |
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end |
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def geometric_mean |
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inject(:*) ** (1.0 / length) |
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end |
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def harmonic_mean |
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length.to_f / inject(0) {|s, m| s += 1.0/m} |
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end |
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end |
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class Range |
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def method_missing(m, *args) |
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case m |
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when /_mean$/ then to_a.send(m) |
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else super |
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end |
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end |
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end |
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p a = (1..10).arithmetic_mean |
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p g = (1..10).geometric_mean |
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p h = (1..10).harmonic_mean |
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# is h < g < a ?? |
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p g.between?(h, a)</lang> |
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outputs |
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<pre>5.5 |
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4.52872868811677 |
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3.41417152147406 |
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true</pre> |
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=={{header|Tcl}}== |
=={{header|Tcl}}== |
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