[Git][NTPsec/ntpsec][master] ntpviz: return 0 as variance of zero or one data items.

[Gary E. Miller]

Gary E. Miller pushed to branch master at NTPsec / ntpsec


Commits:
d734d4a8 by Gary E. Miller at 2016-10-05T13:29:57-07:00
ntpviz: return 0 as variance of zero or one data items.

No need to crash on empty input.

- - - - -


1 changed file:

- ntpstats/ntpviz


Changes:

=====================================
ntpstats/ntpviz
=====================================
--- a/ntpstats/ntpviz
+++ b/ntpstats/ntpviz
@@ -57,7 +57,8 @@ def pstdev(data, mu=None):
     """Calculates the population standard deviation."""
     n = len(data)
     if n < 2:
-        raise ValueError('variance requires at least two data points')
+        # variance requires at least two data points
+        return 0
     ss = _ss(data, mu)
     pvar = ss/n # the population variance
     return pvar**0.5



View it on GitLab: https://gitlab.com/NTPsec/ntpsec/commit/d734d4a8d04995a88f5cca28bf30a2fc7370cede
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