variance() [1/2]

template<typename S >

std::pair<SDef, SRDef> syten::MPS::variance	(	S &&	a,
		Operator const &	op,
		S &&	b,
		SDef	norm = NAN
	)

Calculates the expectation value and the variance.

References syten::abs(), expectation(), std::isnan(), norm(), overlap(), and sqaure_expectation().

Referenced by syten::calc_expval(), syten::do_expval(), syten::Pyten::init_mps(), and variance().

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