Richard D. Moores wrote:
[...]
def harmonic_mean(data):
try:
m = mean(1.0/x for x in data)
except ZeroDivisionError:
return 0.0
if m == 0.0:
return math.copysign(float('inf'), m)
return 1/m
math.copysign! Didn't know about that one. But "mean"? It's not a
built-in function..
No, it's not, it's a function from my stats module.
The naive version is simple:
def mean(data):
return sum(data)/len(data)
My version is a bit more complicated than that, in order to minimize
round-off error and support iterators.
--
Steven
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