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Averages/Arithmetic mean: Difference between revisions
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mean xs = sum xs / Data.List.genericLength xs
=={{header|IDL}}==
If truly only the mean is wanted, one could use
x = [3,1,4,1,5,9]
print,mean(x)
But <tt>mean()</tt> is just a thin wrapper returning the zeroth element of <tt>moment()</tt> :
print,moment(x)
; ==>
3.83333 8.96667 0.580037 -1.25081
which are mean, variance, skewness and kurtosis.
There are no zero-length vectors in IDL. Every variable has at least one value or otherwise it is <tt><Undefined></tt>.
=={{header|J}}==
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