Re: [Boost-users] how to calculate the Sample standard deviation using accumulators Hello,

Subject: Re: [Boost-users] how to calculate the Sample standard deviation using accumulators Hello,
From: Marshall Clow (mclow.lists_at_[hidden])
Date: 2012-01-17 23:13:25

On Jan 17, 2012, at 3:38 PM, Victor Yankee wrote:

> How can I calculate the Sample Standard Deviation over a std::vector of doubles using accumulators?
> 
> Or is there a faster way in boost math or some such?

Google is your friend (second hit for "boost accumulator standard deviation"):
        http://stackoverflow.com/questions/7616511/calculate-mean-and-standard-deviation-from-a-vector-of-samples-in-c-using-boos
and	http://stackoverflow.com/questions/4316716/is-it-possible-to-use-boost-accumulators-with-vectors

        accumulator_set<double, stats<tag::variance> > acc;
        for_each(a_vec.begin(), a_vec.end(), bind<void>(ref(acc), _1));
        
        cout << mean(acc) << endl;
        cout << sqrt(variance(acc)) << endl;

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists_at_[hidden]>

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