Cumulative standard deviation: Difference between revisions
m
Added the Sidef language
m (→{{header|REXX}}: changed extra digits and optimized the sqrt function, added a comment.) |
m (Added the Sidef language) |
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Line 2,981:
-->stdev(T)*sqrt((length(T)-1)/length(T))
ans = 2.</pre>
=={{header|Sidef}}==
<lang ruby>func stddev(x) {
static(num, sum, sum2) = 3.of(0)...;
num++;
sqrt(
(sum2 += x**2) / num -
(((sum += x) / num)**2)
);
}
%n(2 4 4 4 5 5 7 9).each { say stddev(_) };</lang>
{{out}}
<pre>
0
1
0.9428090415820633658677924828064653857143
0.8660254037844386467637231707529361834714
0.9797958971132712392789136298823565567864
1
1.399708424447530341827019471260509366836
2
</pre>
=={{header|Smalltalk}}==
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