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## Struct template weighted_covariance_impl

boost::accumulators::impl::weighted_covariance_impl — Weighted Covariance Estimator.

## Synopsis

    // In header: <boost/accumulators/statistics_fwd.hpp>

    template<typename Sample, typename Weight, typename VariateType,
             typename VariateTag>
    struct weighted_covariance_impl : public accumulator_base {
      // construct/copy/destruct
      template<typename Args> weighted_covariance_impl(Args const &);

      // public member functions
      template<typename Args> void operator()(Args const &);
      result_type result(dont_care) const;
      template<typename Archive> void serialize(Archive &, const unsigned int);
    };

## Description

An iterative Monte Carlo estimator for the weighted covariance , where is a sample and a variate, is given by:

Equation 1.40.

and being the weighted means of the samples and variates and the sum of the first weights .

### `weighted_covariance_impl` public construct/copy/destruct

1.     template<typename Args> weighted_covariance_impl(Args const & args);

### `weighted_covariance_impl` public member functions

1.     template<typename Args> void operator()(Args const & args);

2.     result_type result(dont_care) const;

3.     template<typename Archive>
         void serialize(Archive & ar, const unsigned int file_version);