Re: [boost] Accumulators review

From: Eric Niebler (eric_at_[hidden])
Date: 2007-01-31 13:44:05

John Maddock wrote:
> Matthias Troyer wrote:
>>>> This all leads on to the algorithms used for the mean and variance
>>>> etc: I assume that these are of the "naive" variety?  Perfectly
>>>> satisfactory for simple cases, but there are well known
>>>> pathological situations where these fail.
>>>
>>> Very naive, yes.
>> Actually tag::variance is the naive implementation while tag::variance
>> (immediate) is a more accurate implementation.
> 
> OK I switched my torture test to use the "immediate" versions of the mean 
> and variance, and got all the right answers :-)  So with some suitable 
> warnings in the documentation about which to use when, I'm happy now.

Whew! :-) Thanks for doing these tests, John.If you send me the latest 
and greatest, I'll turn it into a regression test.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com