project_state()

STensor syten::STensorImpl::project_state	(	STensor	input,
		SBasisId const &	which,
		Sector const &	sec,
		Index const	n
	)

Projects the which basis of tensor input onto the n-th state (1-indexed) of the sector sec.

The returned tensor still has basis which, it only lacks nearly all of its elements.

References syten::STensorImpl::SBasis::add(), syten::STensorImpl::STensor::b(), syten::STensorImpl::SBasis::dir(), syten::STensorImpl::SBasis::elementSize(), gen_io(), if_constexpr, syten::makeZero(), std::move(), project(), syten::projector(), syten::STensorImpl::STensor::rank(), syten::STensorImpl::SBasis::set_dir(), syten::STensorImpl::SBasis::set_id(), SYTEN_ASSERT, SYTEN_ASSERT_MSG, and SYTEN_TENSOR_RANK.

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