mean()

template<typename O , typename... Ts>

double mean	(	FilterValueType< O, Ts... > &	cache,
		std::function< double(double &&)> &&	map_,
		std::string	address
	)

Computes \(E_{r(a):\ r \sim D(r)}[f(r(a))]\), where \(D(r)\) is the empirical distribution over records and \( f: double -> double \).

Template Parameters

Ts	Types of distributions in the record

Parameters

cache	the empirical distribution over records
map_	the mapping function \(f\)
address	the address over which to take the mean

Returns

double