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## Struct template covariance_impl

boost::accumulators::impl::covariance_impl — Covariance Estimator.

## Synopsis

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

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

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

## Description

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

Equation 1.17.

and being the means of the samples and variates.

### `covariance_impl` public construct/copy/destruct

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

### `covariance_impl` public member functions

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

2.     result_type result(dont_care) const;